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20=2m+3
We move all terms to the left:
20-(2m+3)=0
We get rid of parentheses
-2m-3+20=0
We add all the numbers together, and all the variables
-2m+17=0
We move all terms containing m to the left, all other terms to the right
-2m=-17
m=-17/-2
m=8+1/2
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