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n in (-oo:+oo)
n/39 = 10/13 // - 10/13
n/39-(10/13) = 0
n/39-10/13 = 0
1/39*n-10/13 = 0 // + 10/13
1/39*n = 10/13 // : 1/39
n = 10/13/1/39
n = 30
n = 30
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