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4.2=m-3.8
We move all terms to the left:
4.2-(m-3.8)=0
We get rid of parentheses
-m+3.8+4.2=0
We add all the numbers together, and all the variables
-1m+8=0
We move all terms containing m to the left, all other terms to the right
-m=-8
m=-8/-1
m=+8
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