x-1+x-m+x-3=2m+1
3x-4-m=2m+1
3x=4+m+2m+1
3x=5+3m
3x/3=(5+3m)/3
x=(5+3m)/3
x-1+x-m+x-3=-(2m+1)
3x-4-m=-2m-1
3x=4+m-2m-1
3x=3-m
3x/3=(3-m)/3
x=(3-m)/3
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