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n in (-oo:+oo)
n/150 = 20/100 // - 20/100
n/150-(20/100) = 0
n/150-1/5 = 0
1/150*n-1/5 = 0 // + 1/5
1/150*n = 1/5 // : 1/150
n = 1/5/1/150
n = 30
n = 30
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