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n in (-oo:+oo)
10/14 = n/21 // - n/21
10/14-(n/21) = 0
5/7-1/21*n = 0 // - 5/7
-1/21*n = -5/7 // : -1/21
n = -5/7/(-1/21)
n = 15
n = 15
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