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n in (-oo:+oo)
2-(n/10) = 12-(n/5) // - 12-(n/5)
n/5-(n/10)-12+2 = 0
1/10*n-10 = 0 // + 10
1/10*n = 10 // : 1/10
n = 10/1/10
n = 100
n = 100
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