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x in (-oo:+oo)
18 = (-3/4)*x // - (-3/4)*x
18-((-3/4)*x) = 0
(3/4)*x+18 = 0
3/4*x+18 = 0 // - 18
3/4*x = -18 // : 3/4
x = -18/3/4
x = -24
x = -24
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