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x in (-oo:+oo)
(7/2)*x+(1/2)*x = 3*x+(5/2)*x+12/2 // - 3*x+(5/2)*x+12/2
(7/2)*x+(1/2)*x-(3*x)-((5/2)*x)-(12/2) = 0
(7/2)*x+(1/2)*x-3*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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