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0.45m-9=0.9m-0.45
We move all terms to the left:
0.45m-9-(0.9m-0.45)=0
We get rid of parentheses
0.45m-0.9m+0.45-9=0
We add all the numbers together, and all the variables
-0.45m-8.55=0
We move all terms containing m to the left, all other terms to the right
-0.45m=8.55
m=8.55/-0.45
m=-19
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