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x in (-oo:+oo)
18 = (-6/5)*x // - (-6/5)*x
18-((-6/5)*x) = 0
(6/5)*x+18 = 0
6/5*x+18 = 0 // - 18
6/5*x = -18 // : 6/5
x = -18/6/5
x = -15
x = -15
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