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(2/5)*(x-4) = (3/4)*x-3 // - (3/4)*x-3
(2/5)*(x-4)-((3/4)*x)+3 = 0
(2/5)*(x-4)+(-3/4)*x+3 = 0
2/5*(x-4)+(-3*x)/4+3 = 0
(2/5*4*(x-4))/4+(-3*x)/4+(3*4)/4 = 0
2/5*4*(x-4)-3*x+3*4 = 0
12-7/5*x-32/5 = 0
28/5-7/5*x = 0
(28/5-7/5*x)/4 = 0
(28/5-7/5*x)/4 = 0 // * 4
28/5-7/5*x = 0
28/5-7/5*x = 0 // - 28/5
-7/5*x = -28/5 // : -7/5
x = -28/5/(-7/5)
x = 4
x = 4
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