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n in (-oo:+oo)
n/30 = 10/100 // - 10/100
n/30-(10/100) = 0
n/30-1/10 = 0
1/30*n-1/10 = 0 // + 1/10
1/30*n = 1/10 // : 1/30
n = 1/10/1/30
n = 3
n = 3
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