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(3x+20)=40
We move all terms to the left:
(3x+20)-(40)=0
We get rid of parentheses
3x+20-40=0
We add all the numbers together, and all the variables
3x-20=0
We move all terms containing x to the left, all other terms to the right
3x=20
x=20/3
x=6+2/3
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