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m in (-oo:+oo)
(-1/2)*m-3 = 2 // - 2
(-1/2)*m-3-2 = 0
-1/2*m-5 = 0 // + 5
-1/2*m = 5 // : -1/2
m = 5/(-1/2)
m = -10
m = -10
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