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