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n in (-oo:+oo)
n/7 = 18/14 // - 18/14
n/7-(18/14) = 0
n/7-9/7 = 0
1/7*n-9/7 = 0 // + 9/7
1/7*n = 9/7 // : 1/7
n = 9/7/1/7
n = 9
n = 9
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