algebra

9x -12 = 78. I need the steps to solve.

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  1. 9x-12 = 78
    (add 12 to both sides)
    9x-12+12 = 78+12
    (divide by 9 to isolate x)
    9x=90
    9x/9 = 90/9
    x = 10

    Check *

    9(10) - 12 = 78
    (9 x 10) - 12 = 78
    90 - 12 = 78
    78 = 78

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