$\"\"$

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The equation is $\"\"$ .

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$\"\"$ \ \

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Case 1 \ \

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$\"\"$

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$\"\"$ \ \

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

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$\"\"$ (Divide each side by 10)

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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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$\"\"$ (Divide each side by negative 2 )

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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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$\"\"$

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$\"\"$

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The solution set is $\"\"$ .