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(5/2)*x+(1/2)*x = 3*x+(9/2)*x+45/2 // - 3*x+(9/2)*x+45/2
(5/2)*x+(1/2)*x-(3*x)-((9/2)*x)-(45/2) = 0
(5/2)*x+(1/2)*x-3*x+(-9/2)*x-45/2 = 0
-9/2*x-45/2 = 0 // + 45/2
-9/2*x = 45/2 // : -9/2
x = 45/2/(-9/2)
x = -5
x = -5
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