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x in (-oo:+oo)
18 = (-3/7)*x // - (-3/7)*x
18-((-3/7)*x) = 0
(3/7)*x+18 = 0
3/7*x+18 = 0 // - 18
3/7*x = -18 // : 3/7
x = -18/3/7
x = -42
x = -42
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