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15=2m-4
We move all terms to the left:
15-(2m-4)=0
We get rid of parentheses
-2m+4+15=0
We add all the numbers together, and all the variables
-2m+19=0
We move all terms containing m to the left, all other terms to the right
-2m=-19
m=-19/-2
m=9+1/2
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