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500=m*80
We move all terms to the left:
500-(m*80)=0
We add all the numbers together, and all the variables
-(+m*80)+500=0
We get rid of parentheses
-m*80+500=0
Wy multiply elements
-80m+500=0
We move all terms containing m to the left, all other terms to the right
-80m=-500
m=-500/-80
m=6+1/4
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