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2+8m=9m-3
We move all terms to the left:
2+8m-(9m-3)=0
We get rid of parentheses
8m-9m+3+2=0
We add all the numbers together, and all the variables
-1m+5=0
We move all terms containing m to the left, all other terms to the right
-m=-5
m=-5/-1
m=+5
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