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n in (-oo:+oo)
n-((5/4)*n) = 5 // - 5
n-((5/4)*n)-5 = 0
n+(-5/4)*n-5 = 0
-1/4*n-5 = 0 // + 5
-1/4*n = 5 // : -1/4
n = 5/(-1/4)
n = -20
n = -20
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