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n in (-oo:+oo)
1/3 = n+2/5 // - n+2/5
1/3-n-(2/5) = 0
1/3-n-2/5 = 0
-n-1/15 = 0 // + 1/15
-n = 1/15 // * -1
n = -1/15
n = -1/15
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