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n in (-oo:+oo)
(5/7)*n-n+3/5 = 177/245 // - 177/245
(5/7)*n-n+3/5-(177/245) = 0
(5/7)*n-n+3/5-177/245 = 0
-2/7*n-6/49 = 0 // + 6/49
-2/7*n = 6/49 // : -2/7
n = 6/49/(-2/7)
n = -3/7
n = -3/7
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