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n in (-oo:+oo)
n/20 = 3/6 // - 3/6
n/20-(3/6) = 0
n/20-1/2 = 0
1/20*n-1/2 = 0 // + 1/2
1/20*n = 1/2 // : 1/20
n = 1/2/1/20
n = 10
n = 10
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