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3.8=m-2.2
We move all terms to the left:
3.8-(m-2.2)=0
We get rid of parentheses
-m+2.2+3.8=0
We add all the numbers together, and all the variables
-1m+6=0
We move all terms containing m to the left, all other terms to the right
-m=-6
m=-6/-1
m=+6
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