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13=4m-5
We move all terms to the left:
13-(4m-5)=0
We get rid of parentheses
-4m+5+13=0
We add all the numbers together, and all the variables
-4m+18=0
We move all terms containing m to the left, all other terms to the right
-4m=-18
m=-18/-4
m=4+1/2
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