\"\"

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The equation is \"\".

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\"\"            (Divide each side by 90)

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\"\"                   (Cancel common terms)

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\"\"                    (Divide: \"\")\"\"

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Check:

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The equation is \"\", on substitute \"\".

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\"\"

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\"\"                   (Multiply: \"\")

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The solution is true.\"\"

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The solution is \"\".