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2+(5x+3)=20
We move all terms to the left:
2+(5x+3)-(20)=0
We add all the numbers together, and all the variables
(5x+3)-18=0
We get rid of parentheses
5x+3-18=0
We add all the numbers together, and all the variables
5x-15=0
We move all terms containing x to the left, all other terms to the right
5x=15
x=15/5
x=3
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