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4+(2x+2)=20
We move all terms to the left:
4+(2x+2)-(20)=0
We add all the numbers together, and all the variables
(2x+2)-16=0
We get rid of parentheses
2x+2-16=0
We add all the numbers together, and all the variables
2x-14=0
We move all terms containing x to the left, all other terms to the right
2x=14
x=14/2
x=7
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