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20=75-m
We move all terms to the left:
20-(75-m)=0
We add all the numbers together, and all the variables
-(-1m+75)+20=0
We get rid of parentheses
1m-75+20=0
We add all the numbers together, and all the variables
m-55=0
We move all terms containing m to the left, all other terms to the right
m=55
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