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23m-5=21m+10
We move all terms to the left:
23m-5-(21m+10)=0
We get rid of parentheses
23m-21m-10-5=0
We add all the numbers together, and all the variables
2m-15=0
We move all terms containing m to the left, all other terms to the right
2m=15
m=15/2
m=7+1/2
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