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12.8=m-8.3
We move all terms to the left:
12.8-(m-8.3)=0
We get rid of parentheses
-m+8.3+12.8=0
We add all the numbers together, and all the variables
-1m+21.1=0
We move all terms containing m to the left, all other terms to the right
-m=-21.1
m=-21.1/-1
m=21+0.1/1
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