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N in (-oo:+oo)
(1/3)*N+1/4 = 1/2 // - 1/2
(1/3)*N+1/4-(1/2) = 0
(1/3)*N+1/4-1/2 = 0
1/3*N-1/4 = 0 // + 1/4
1/3*N = 1/4 // : 1/3
N = 1/4/1/3
N = 3/4
N = 3/4
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