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n in (-oo:+oo)
n-((1/5)*n) = 28 // - 28
n-((1/5)*n)-28 = 0
n+(-1/5)*n-28 = 0
4/5*n-28 = 0 // + 28
4/5*n = 28 // : 4/5
n = 28/4/5
n = 35
n = 35
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