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n in (-oo:+oo)
(5/7)*n+5/8 = -5/56 // + -5/56
(5/7)*n+5/8-(-5/56) = 0
(5/7)*n+5/8+5/56 = 0
5/7*n+5/7 = 0 // - 5/7
5/7*n = -5/7 // : 5/7
n = -5/7/5/7
n = -1
n = -1
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