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13-7m=3-5m
We move all terms to the left:
13-7m-(3-5m)=0
We add all the numbers together, and all the variables
-7m-(-5m+3)+13=0
We get rid of parentheses
-7m+5m-3+13=0
We add all the numbers together, and all the variables
-2m+10=0
We move all terms containing m to the left, all other terms to the right
-2m=-10
m=-10/-2
m=+5
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