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(4*x-10+12)/2 = 5*x-20 // - 5*x-20
(4*x-10+12)/2-(5*x)+20 = 0
(4*x-10+12)/2-5*x+20 = 0
(4*x+2)/2-5*x+20 = 0
(4*x+2)/2+(-5*2*x)/2+(2*20)/2 = 0
4*x-5*2*x+2*20+2 = 0
2-6*x+40 = 0
42-6*x = 0
(42-6*x)/2 = 0
(42-6*x)/2 = 0 // * 2
42-6*x = 0
42-6*x = 0 // - 42
-6*x = -42 // : -6
x = -42/(-6)
x = 7
x = 7
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