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x in (-oo:+oo)
18-(8*(2-((1/2)*x))) = 3*x // - 3*x
18-(8*(2-((1/2)*x)))-(3*x) = 0
18-8*((-1/2)*x+2)-3*x = 0
18-8*(2-1/2*x)-3*x = 0
18-8*(2-1/2*x)-3*x = 0
x-16+18 = 0
x+2 = 0
x+2 = 0
x+2 = 0 // - 2
x = -2
x = -2
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