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n in (-oo:+oo)
n/42 = 2/12 // - 2/12
n/42-(2/12) = 0
n/42-1/6 = 0
1/42*n-1/6 = 0 // + 1/6
1/42*n = 1/6 // : 1/42
n = 1/6/1/42
n = 7
n = 7
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