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n in (-oo:+oo)
6/5 = n+(2/2)*n-3 // - n+(2/2)*n-3
6/5-n-((2/2)*n)+3 = 0
6/5-n-n+3 = 0
21/5-2*n = 0 // - 21/5
-2*n = -21/5 // : -2
n = -21/5/(-2)
n = 21/10
n = 21/10
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