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2x+(x+20)=100
We move all terms to the left:
2x+(x+20)-(100)=0
We get rid of parentheses
2x+x+20-100=0
We add all the numbers together, and all the variables
3x-80=0
We move all terms containing x to the left, all other terms to the right
3x=80
x=80/3
x=26+2/3
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