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x in (-oo:+oo)
5/8-(7*x) = (-2/7)*x+5/8 // - (-2/7)*x+5/8
5/8-(7*x)-((-2/7)*x)-(5/8) = 0
(2/7)*x-7*x+5/8-5/8 = 0
-47/7*x = 0 // : -47/7
x = 0
x = 0
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