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n in (-oo:+oo)
n/7 = 5/21 // - 5/21
n/7-(5/21) = 0
n/7-5/21 = 0
1/7*n-5/21 = 0 // + 5/21
1/7*n = 5/21 // : 1/7
n = 5/21/1/7
n = 5/3
n = 5/3
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