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m in (-oo:+oo)
12 = (1/2)*m // - (1/2)*m
12-((1/2)*m) = 0
(-1/2)*m+12 = 0
12-1/2*m = 0 // - 12
-1/2*m = -12 // : -1/2
m = -12/(-1/2)
m = 24
m = 24
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