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n in (-oo:+oo)
n/30 = 10/50 // - 10/50
n/30-(10/50) = 0
n/30-1/5 = 0
1/30*n-1/5 = 0 // + 1/5
1/30*n = 1/5 // : 1/30
n = 1/5/1/30
n = 6
n = 6
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