Question

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

Answer 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