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x in (-oo:+oo)
18-((8*x)/4) = 3*x // - 3*x
18-((8*x)/4)-(3*x) = 0
18-2*x-3*x = 0
18-5*x = 0 // - 18
-5*x = -18 // : -5
x = -18/(-5)
x = 18/5
x = 18/5
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