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0.45m+40=0.40m+45
We move all terms to the left:
0.45m+40-(0.40m+45)=0
We get rid of parentheses
0.45m-0.40m-45+40=0
We add all the numbers together, and all the variables
0.05m-5=0
We move all terms containing m to the left, all other terms to the right
0.05m=5
m=5/0.05
m=100
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