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(2x+20)+x=90
We move all terms to the left:
(2x+20)+x-(90)=0
We add all the numbers together, and all the variables
x+(2x+20)-90=0
We get rid of parentheses
x+2x+20-90=0
We add all the numbers together, and all the variables
3x-70=0
We move all terms containing x to the left, all other terms to the right
3x=70
x=70/3
x=23+1/3
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