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-(-0.3+m)=12.3+4m
We move all terms to the left:
-(-0.3+m)-(12.3+4m)=0
We add all the numbers together, and all the variables
-(m-0.3)-(4m+12.3)=0
We get rid of parentheses
-m-4m+0.3-12.3=0
We add all the numbers together, and all the variables
-5m-12=0
We move all terms containing m to the left, all other terms to the right
-5m=12
m=12/-5
m=-2+2/5
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