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n in (-oo:+oo)
n+7*n+7/10 = 61/30 // - 61/30
n+7*n+7/10-(61/30) = 0
n+7*n+7/10-61/30 = 0
8*n-4/3 = 0 // + 4/3
8*n = 4/3 // : 8
n = 4/3/8
n = 1/6
n = 1/6
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