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x in (-oo:+oo)
18 = (-6/7)*x // - (-6/7)*x
18-((-6/7)*x) = 0
(6/7)*x+18 = 0
6/7*x+18 = 0 // - 18
6/7*x = -18 // : 6/7
x = -18/6/7
x = -21
x = -21
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