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m in (-oo:+oo)
5 = (1/2)*m // - (1/2)*m
5-((1/2)*m) = 0
(-1/2)*m+5 = 0
5-1/2*m = 0 // - 5
-1/2*m = -5 // : -1/2
m = -5/(-1/2)
m = 10
m = 10
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