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-1.2+0.4=m-1
We move all terms to the left:
-1.2+0.4-(m-1)=0
We add all the numbers together, and all the variables
-(m-1)-0.8=0
We get rid of parentheses
-m+1-0.8=0
We add all the numbers together, and all the variables
-1m+0.2=0
We move all terms containing m to the left, all other terms to the right
-m=-0.2
m=-0.2/-1
m=0.2/1
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