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