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x in (-oo:+oo)
42 = (-6/5)*x // - (-6/5)*x
42-((-6/5)*x) = 0
(6/5)*x+42 = 0
6/5*x+42 = 0 // - 42
6/5*x = -42 // : 6/5
x = -42/6/5
x = -35
x = -35
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