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(3/4)*(12-x) = 6 // - 6
(3/4)*(12-x)-6 = 0
3/4*(12-x)-6 = 0
3/4*(12-x)-6 = 0
3-3/4*x = 0
3-3/4*x = 0
3-3/4*x = 0 // - 3
-3/4*x = -3 // : -3/4
x = -3/(-3/4)
x = 4
x = 4
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