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n in (-oo:+oo)
(-4/5)*n-((3/5)*n)+5/6 = 113/60 // - 113/60
(-4/5)*n-((3/5)*n)+5/6-(113/60) = 0
(-4/5)*n+(-3/5)*n+5/6-113/60 = 0
-7/5*n-21/20 = 0 // + 21/20
-7/5*n = 21/20 // : -7/5
n = 21/20/(-7/5)
n = -3/4
n = -3/4
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