(-2+m)-(-2m-3)=-8

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(-2+m)-(-2m-3)=-8

(-2+m)-(-2m-3)=-8
(-2+m)-(-2m-3)=-8

(-2+m)-(-2m-3)=-8
由原方程得:-2+m+2m+3=-8
3m+1=-8
3m=-9
m=-3

m=7/3

(-2+m)-(-2m-3)=-8
-2+m+2m+3=-8
3m+1=-8
3m=-9
m=-3