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109=65+.80m
We move all terms to the left:
109-(65+.80m)=0
We add all the numbers together, and all the variables
-(.80m+65)+109=0
We get rid of parentheses
-.80m-65+109=0
We add all the numbers together, and all the variables
-0.8m+44=0
We move all terms containing m to the left, all other terms to the right
-0.8m=-44
m=-44/-0.8
m=+55
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