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x in (-oo:+oo)
18 = (-3/2)*x // - (-3/2)*x
18-((-3/2)*x) = 0
(3/2)*x+18 = 0
3/2*x+18 = 0 // - 18
3/2*x = -18 // : 3/2
x = -18/3/2
x = -12
x = -12
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