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x in (-oo:+oo)
18-(x/4) = x/5 // - x/5
18-(x/4)-(x/5) = 0
18-9/20*x = 0 // - 18
-9/20*x = -18 // : -9/20
x = -18/(-9/20)
x = 40
x = 40
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