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x in (-oo:+oo)
-13/2 = 3*x+(1/2)*x+4 // - 3*x+(1/2)*x+4
-(3*x)-((1/2)*x)-13/2-4 = 0
(-1/2)*x-3*x-13/2-4 = 0
-7/2*x-21/2 = 0 // + 21/2
-7/2*x = 21/2 // : -7/2
x = 21/2/(-7/2)
x = -3
x = -3
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