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28.5=1.4m
We move all terms to the left:
28.5-(1.4m)=0
We add all the numbers together, and all the variables
-(+1.4m)+28.5=0
We get rid of parentheses
-1.4m+28.5=0
We move all terms containing m to the left, all other terms to the right
-1.4m=-28.5
m=-28.5/-1.4
m=20+0.5/1.4
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