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n in (-oo:+oo)
7/5-((20*n)/3) = (8*n)/3-((4*n)/3)+2/5 // - (8*n)/3-((4*n)/3)+2/5
(4*n)/3-((20*n)/3)-((8*n)/3)+7/5-(2/5) = 0
(-20/3)*n+(-8/3)*n+(4*n)/3+7/5-2/5 = 0
1-8*n = 0 // - 1
-8*n = -1 // : -8
n = -1/(-8)
n = 1/8
n = 1/8
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