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