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n in (-oo:+oo)
n/8 = 42/48 // - 42/48
n/8-(42/48) = 0
n/8-7/8 = 0
1/8*n-7/8 = 0 // + 7/8
1/8*n = 7/8 // : 1/8
n = 7/8/1/8
n = 7
n = 7
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