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n in (-oo:+oo)
n/4-((5*n)/8) = 0.25 // - 0.25
n/4-((5*n)/8)-0.25 = 0
n/4+(-5/8)*n-0.25 = 0
-3/8*n-0.25 = 0 // + 0.25
-3/8*n = 0.25 // : -3/8
n = 0.25/(-3/8)
n = -0.66666667
n = -0.66666667
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