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3.9=m-22.1
We move all terms to the left:
3.9-(m-22.1)=0
We get rid of parentheses
-m+22.1+3.9=0
We add all the numbers together, and all the variables
-1m+26=0
We move all terms containing m to the left, all other terms to the right
-m=-26
m=-26/-1
m=+26
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