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$\"\"$

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The equation is $\"\"$ . \ \ $\"\"$ and $\"\"$

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Case 1

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$\"\"$

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(Add $\"\"$ to each side)

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$\"\"$

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$\"\"$

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(Subtract 20 from each side )

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$\"\"$

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$\"\"$

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(Divide each side by 10 ) \ \

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$\"\"$ \ \

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$\"\"$

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Case 2

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$\"\"$ \ \

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(Subtract $\"\"$ to each side )

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$\"\"$

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$\"\"$

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(Subtract each side by 20)

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$\"\"$ \ \

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$\"\"$

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(Divide each side by 6 ) \ \ $\"\"$ \ \

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$\"\"$

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The solutions are $\"\"$ and $\"\"$ . $\"\"$

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Check:

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To check, substitute $\"\"$ in the original equation $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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To check, substitute $\"\"$ in the original equation $\"\"$ .

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$\"\"$

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$\"\"$

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(Multiply each side by negative 1) \ \

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$\"\"$

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$\"\"$

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The solution set is $\"\"$ .