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n in (-oo:+oo)
(7*n)/8 = 50-1 // - 50-1
(7*n)/8-50+1 = 0
7/8*n-49 = 0 // + 49
7/8*n = 49 // : 7/8
n = 49/7/8
n = 56
n = 56
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