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n in (-oo:+oo)
n/100 = 22/40 // - 22/40
n/100-(22/40) = 0
n/100-11/20 = 0
1/100*n-11/20 = 0 // + 11/20
1/100*n = 11/20 // : 1/100
n = 11/20/1/100
n = 55
n = 55
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