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n in (-oo:+oo)
n/7-(7/7) = 55/56 // - 55/56
n/7-(7/7)-(55/56) = 0
n/7-55/56-1 = 0
1/7*n-111/56 = 0 // + 111/56
1/7*n = 111/56 // : 1/7
n = 111/56/1/7
n = 111/8
n = 111/8
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