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m in (-oo:+oo)
0.5*m = 2/3 // - 2/3
0.5*m-(2/3) = 0
0.5*m-2/3 = 0
0.5*m-2/3 = 0 // + 2/3
0.5*m = 2/3 // : 0.5
m = 2/3/0.5
m = 1.33333334
m = 1.33333334
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