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x in (-oo:+oo)
(1/2)*(18-x) = (1/3)*(6-(4*x)) // - (1/3)*(6-(4*x))
(1/2)*(18-x)-((1/3)*(6-(4*x))) = 0
(1/2)*(18-x)+(-1/3)*(6-4*x) = 0
1/2*(18-x)-1/3*(6-4*x) = 0
1/2*(18-x)-1/3*(6-4*x) = 0
5/6*x+7 = 0
5/6*x+7 = 0
5/6*x+7 = 0 // - 7
5/6*x = -7 // : 5/6
x = -7/5/6
x = -42/5
x = -42/5
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