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-0.4(m+3)=4
We move all terms to the left:
-0.4(m+3)-(4)=0
We multiply parentheses
-0.4m-1.2-4=0
We add all the numbers together, and all the variables
-0.4m-5.2=0
We move all terms containing m to the left, all other terms to the right
-0.4m=5.2
m=5.2/-0.4
m=-13
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