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n in (-oo:+oo)
n/5 = 3/10 // - 3/10
n/5-(3/10) = 0
n/5-3/10 = 0
1/5*n-3/10 = 0 // + 3/10
1/5*n = 3/10 // : 1/5
n = 3/10/1/5
n = 3/2
n = 3/2
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