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(7/2)*x+(1/2)*x = 3*x+(7/2)*x+10/2 // - 3*x+(7/2)*x+10/2
(7/2)*x+(1/2)*x-(3*x)-((7/2)*x)-(10/2) = 0
(7/2)*x+(1/2)*x-3*x+(-7/2)*x-5 = 0
-5/2*x-5 = 0 // + 5
-5/2*x = 5 // : -5/2
x = 5/(-5/2)
x = -2
x = -2
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