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n in (-oo:+oo)
(4/7)*n+3/8 = 149/56 // - 149/56
(4/7)*n+3/8-(149/56) = 0
(4/7)*n+3/8-149/56 = 0
4/7*n-16/7 = 0 // + 16/7
4/7*n = 16/7 // : 4/7
n = 16/7/4/7
n = 4
n = 4
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