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x in (-oo:+oo)
18 = 3*x+(1/2)*x+1+3 // - 3*x+(1/2)*x+1+3
18-(3*x)-((1/2)*x)-3-1 = 0
(-1/2)*x-3*x-3-1+18 = 0
14-7/2*x = 0 // - 14
-7/2*x = -14 // : -7/2
x = -14/(-7/2)
x = 4
x = 4
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