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n in (-oo:+oo)
n/3 = 15/6 // - 15/6
n/3-(15/6) = 0
n/3-5/2 = 0
1/3*n-5/2 = 0 // + 5/2
1/3*n = 5/2 // : 1/3
n = 5/2/1/3
n = 15/2
n = 15/2
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