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807=4m+7
We move all terms to the left:
807-(4m+7)=0
We get rid of parentheses
-4m-7+807=0
We add all the numbers together, and all the variables
-4m+800=0
We move all terms containing m to the left, all other terms to the right
-4m=-800
m=-800/-4
m=+200
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