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(5/4)*(12-x) = 2/3 // - 2/3
(5/4)*(12-x)-(2/3) = 0
(5/4)*(12-x)-2/3 = 0
5/4*(12-x)-2/3 = 0
(5/4*3*(12-x))/3-2/3 = 0
5/4*3*(12-x)-2 = 0
43-15/4*x = 0
(43-15/4*x)/3 = 0
(43-15/4*x)/3 = 0 // * 3
43-15/4*x = 0
43-15/4*x = 0 // - 43
-15/4*x = -43 // : -15/4
x = -43/(-15/4)
x = 172/15
x = 172/15
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