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20=25-m
We move all terms to the left:
20-(25-m)=0
We add all the numbers together, and all the variables
-(-1m+25)+20=0
We get rid of parentheses
1m-25+20=0
We add all the numbers together, and all the variables
m-5=0
We move all terms containing m to the left, all other terms to the right
m=5
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