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7.4=m+4
We move all terms to the left:
7.4-(m+4)=0
We get rid of parentheses
-m-4+7.4=0
We add all the numbers together, and all the variables
-1m+3.4=0
We move all terms containing m to the left, all other terms to the right
-m=-3.4
m=-3.4/-1
m=3+0.4/1
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