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(4x+20)/3-7.2=12.8
We move all terms to the left:
(4x+20)/3-7.2-(12.8)=0
We add all the numbers together, and all the variables
(4x+20)/3-20=0
We multiply all the terms by the denominator
(4x+20)-20*3=0
We add all the numbers together, and all the variables
(4x+20)-60=0
We get rid of parentheses
4x+20-60=0
We add all the numbers together, and all the variables
4x-40=0
We move all terms containing x to the left, all other terms to the right
4x=40
x=40/4
x=10
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