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m in (-oo:+oo)
2*m = 1/2 // - 1/2
2*m-(1/2) = 0
2*m-1/2 = 0
2*m-1/2 = 0 // + 1/2
2*m = 1/2 // : 2
m = 1/2/2
m = 1/4
m = 1/4
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