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N in (-oo:+oo)
N*((1/4)*N-((11/4)*N)) = 0
N*((1/4)*N+(-11/4)*N) = 0
-5/2*N*N = 0
( -5/2*N )
-5/2*N = 0 // : -5/2
N = 0
( N )
N = 0
N in { 0, 0 }
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