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N in (-oo:+oo)
-42/5 = (6/5)*N+6/5 // - (6/5)*N+6/5
-((6/5)*N)-42/5-(6/5) = 0
(-6/5)*N-42/5-6/5 = 0
-6/5*N-48/5 = 0 // + 48/5
-6/5*N = 48/5 // : -6/5
N = 48/5/(-6/5)
N = -8
N = -8
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