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(5/2)*x+(1/2)*x = 2*x+(5/2)*x+12/2 // - 2*x+(5/2)*x+12/2
(5/2)*x+(1/2)*x-(2*x)-((5/2)*x)-(12/2) = 0
(5/2)*x+(1/2)*x-2*x+(-5/2)*x-6 = 0
-3/2*x-6 = 0 // + 6
-3/2*x = 6 // : -3/2
x = 6/(-3/2)
x = -4
x = -4
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