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N in (-oo:+oo)
N/2+6 = 13 // - 13
N/2-13+6 = 0
1/2*N-13+6 = 0 // - 6-13
1/2*N = -(6-13) // : 1/2
N = (-(6-13))/1/2
N = 2*(13-6)
N = 2*(13-6)
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