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N in (-oo:+oo)
N/1.5 = 7.5/9 // - 7.5/9
N/1.5-(7.5/9) = 0
N/1.5-0.83333333 = 0
0.66666667*N-0.83333333 = 0 // + 0.83333333
0.66666667*N = 0.83333333 // : 0.66666667
N = 0.83333333/0.66666667
N = 1.24999999
N = 1.24999999
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