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x in (-oo:+oo)
18-(4*x) = 5/2 // - 5/2
18-(4*x)-(5/2) = 0
18-4*x-5/2 = 0
31/2-4*x = 0 // - 31/2
-4*x = -31/2 // : -4
x = -31/2/(-4)
x = 31/8
x = 31/8
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