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n in (-oo:+oo)
n/10 = 36/30 // - 36/30
n/10-(36/30) = 0
n/10-6/5 = 0
1/10*n-6/5 = 0 // + 6/5
1/10*n = 6/5 // : 1/10
n = 6/5/1/10
n = 12
n = 12
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