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250=124-m
We move all terms to the left:
250-(124-m)=0
We add all the numbers together, and all the variables
-(-1m+124)+250=0
We get rid of parentheses
1m-124+250=0
We add all the numbers together, and all the variables
m+126=0
We move all terms containing m to the left, all other terms to the right
m=-126
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