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40/5=x/80
We move all terms to the left:
40/5-(x/80)=0
We add all the numbers together, and all the variables
-(+x/80)+40/5=0
We add all the numbers together, and all the variables
-(+x/80)+8=0
We get rid of parentheses
-x/80+8=0
We multiply all the terms by the denominator
-x+8*80=0
We add all the numbers together, and all the variables
-1x+640=0
We move all terms containing x to the left, all other terms to the right
-x=-640
x=-640/-1
x=+640
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