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n in (-oo:+oo)
n/45 = 5/75 // - 5/75
n/45-(5/75) = 0
n/45-1/15 = 0
1/45*n-1/15 = 0 // + 1/15
1/45*n = 1/15 // : 1/45
n = 1/15/1/45
n = 3
n = 3
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