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n in (-oo:+oo)
n/12 = 12.5/15 // - 12.5/15
n/12-(12.5/15) = 0
n/12-0.83333333 = 0
1/12*n-0.83333333 = 0 // + 0.83333333
1/12*n = 0.83333333 // : 1/12
n = 0.83333333/1/12
n = 10.00000036
n = 10.00000036
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