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13-5m=4-m
We move all terms to the left:
13-5m-(4-m)=0
We add all the numbers together, and all the variables
-5m-(-1m+4)+13=0
We get rid of parentheses
-5m+1m-4+13=0
We add all the numbers together, and all the variables
-4m+9=0
We move all terms containing m to the left, all other terms to the right
-4m=-9
m=-9/-4
m=2+1/4
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