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N in (-oo:+oo)
7/15-(-1/3) = N // - N
7/15-N-(-1/3) = 0
7/15-N+1/3 = 0
4/5-N = 0 // - 4/5
-N = -4/5 // * -1
N = 4/5
N = 4/5
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