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N in (-oo:+oo)
N/3-13.5 = 2.8 // - 2.8
N/3-13.5-2.8 = 0
1/3*N-16.3 = 0 // + 16.3
1/3*N = 16.3 // : 1/3
N = 16.3/1/3
N = 48.90000049
N = 48.90000049
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