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m in (-oo:+oo)
(-1/2)*m = 3/2 // - 3/2
(-1/2)*m-(3/2) = 0
(-1/2)*m-3/2 = 0
-1/2*m-3/2 = 0 // + 3/2
-1/2*m = 3/2 // : -1/2
m = 3/2/(-1/2)
m = -3
m = -3
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