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m in (-oo:+oo)
-4 = 3*m-m-3 // - 3*m-m-3
m-(3*m)-4+3 = 0
m-3*m-4+3 = 0
-2*m-1 = 0 // + 1
-2*m = 1 // : -2
m = 1/(-2)
m = -1/2
m = -1/2
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