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x in (-oo:+oo)
6*(3-(x/2)) = 3*x // - 3*x
6*(3-(x/2))-(3*x) = 0
6*(3-(x/2))-3*x = 0
6*(3-1/2*x)-3*x = 0
6*(3-1/2*x)-3*x = 0
18-6*x = 0
18-6*x = 0
18-6*x = 0 // - 18
-6*x = -18 // : -6
x = -18/(-6)
x = 3
x = 3
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