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n in (-oo:+oo)
n/42 = 3/21 // - 3/21
n/42-(3/21) = 0
n/42-1/7 = 0
1/42*n-1/7 = 0 // + 1/7
1/42*n = 1/7 // : 1/42
n = 1/7/1/42
n = 6
n = 6
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