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n in (-oo:+oo)
440*n-((15*n)/20) = 28-n // - 28-n
440*n-((15*n)/20)+n-28 = 0
440*n+(-3/4)*n+n-28 = 0
1761/4*n-28 = 0 // + 28
1761/4*n = 28 // : 1761/4
n = 28/1761/4
n = 112/1761
n = 112/1761
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