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n in (-oo:+oo)
n/99 = 60/108 // - 60/108
n/99-(60/108) = 0
n/99-5/9 = 0
1/99*n-5/9 = 0 // + 5/9
1/99*n = 5/9 // : 1/99
n = 5/9/1/99
n = 55
n = 55
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