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