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n in (-oo:+oo)
n/12 = 225/15 // - 225/15
n/12-(225/15) = 0
n/12-15 = 0
1/12*n-15 = 0 // + 15
1/12*n = 15 // : 1/12
n = 15/1/12
n = 180
n = 180
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