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x in (-oo:+oo)
(1/2)*x-((1/3)*(9-x)) = 3*x // - 3*x
(1/2)*x-((1/3)*(9-x))-(3*x) = 0
(-1/3)*(9-x)+(1/2)*x-3*x = 0
x/2-1/3*(9-x)-3*x = 0
(-1/3*2*(9-x))/2+x/2+(-3*2*x)/2 = 0
x-1/3*2*(9-x)-3*2*x = 0
5/3*x-6*x-6 = 0
-13/3*x-6 = 0
(-13/3*x-6)/2 = 0
(-13/3*x-6)/2 = 0 // * 2
-13/3*x-6 = 0
-13/3*x-6 = 0 // + 6
-13/3*x = 6 // : -13/3
x = 6/(-13/3)
x = -18/13
x = -18/13
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