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n in (-oo:+oo)
n/3 = 15/9 // - 15/9
n/3-(15/9) = 0
n/3-5/3 = 0
1/3*n-5/3 = 0 // + 5/3
1/3*n = 5/3 // : 1/3
n = 5/3/1/3
n = 5
n = 5
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