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x in (-oo:+oo)
48 = (-6/7)*x // - (-6/7)*x
48-((-6/7)*x) = 0
(6/7)*x+48 = 0
6/7*x+48 = 0 // - 48
6/7*x = -48 // : 6/7
x = -48/6/7
x = -56
x = -56
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