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n in (-oo:+oo)
n/20 = 225/15 // - 225/15
n/20-(225/15) = 0
n/20-15 = 0
1/20*n-15 = 0 // + 15
1/20*n = 15 // : 1/20
n = 15/1/20
n = 300
n = 300
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