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