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m in (-oo:+oo)
-m-7 = 3*m-3 // - 3*m-3
3-m-(3*m)-7 = 0
3-m-3*m-7 = 0
-4*m-4 = 0 // + 4
-4*m = 4 // : -4
m = 4/(-4)
m = -1
m = -1
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