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15=m/4+13
We move all terms to the left:
15-(m/4+13)=0
We get rid of parentheses
-m/4-13+15=0
We multiply all the terms by the denominator
-m-13*4+15*4=0
We add all the numbers together, and all the variables
-1m+8=0
We move all terms containing m to the left, all other terms to the right
-m=-8
m=-8/-1
m=+8
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