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(3/4)*(12-x) = 4 // - 4
(3/4)*(12-x)-4 = 0
3/4*(12-x)-4 = 0
3/4*(12-x)-4 = 0
5-3/4*x = 0
5-3/4*x = 0
5-3/4*x = 0 // - 5
-3/4*x = -5 // : -3/4
x = -5/(-3/4)
x = 20/3
x = 20/3
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