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21.7=m7.7
We move all terms to the left:
21.7-(m7.7)=0
We add all the numbers together, and all the variables
-(+m7.7)+21.7=0
We get rid of parentheses
-m7.7+21.7=0
We move all terms containing m to the left, all other terms to the right
-m7.7=-21.7
m=-21.7/1
m=-21.7
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