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n in (-oo:+oo)
n/5 = 12-(n/10) // - 12-(n/10)
n/5+n/10-12 = 0
3/10*n-12 = 0 // + 12
3/10*n = 12 // : 3/10
n = 12/3/10
n = 40
n = 40
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