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n in (-oo:+oo)
n/3+60 = n/15+84 // - n/15+84
n/3-(n/15)-84+60 = 0
4/15*n-24 = 0 // + 24
4/15*n = 24 // : 4/15
n = 24/4/15
n = 90
n = 90
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