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n in (-oo:+oo)
n/8 = 72/12 // - 72/12
n/8-(72/12) = 0
n/8-6 = 0
1/8*n-6 = 0 // + 6
1/8*n = 6 // : 1/8
n = 6/1/8
n = 48
n = 48
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