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n in (-oo:+oo)
n/20 = 7-(n/15) // - 7-(n/15)
n/20+n/15-7 = 0
7/60*n-7 = 0 // + 7
7/60*n = 7 // : 7/60
n = 7/7/60
n = 60
n = 60
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