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x in (-oo:+oo)
42 = (-6/7)*x // - (-6/7)*x
42-((-6/7)*x) = 0
(6/7)*x+42 = 0
6/7*x+42 = 0 // - 42
6/7*x = -42 // : 6/7
x = -42/6/7
x = -49
x = -49
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