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N in (-oo:+oo)
(5/6)*N+7 = (1/4)*N // - (1/4)*N
(5/6)*N-((1/4)*N)+7 = 0
(5/6)*N+(-1/4)*N+7 = 0
7/12*N+7 = 0 // - 7
7/12*N = -7 // : 7/12
N = -7/7/12
N = -12
N = -12
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