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