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(2x+20)+3x=90
We move all terms to the left:
(2x+20)+3x-(90)=0
We add all the numbers together, and all the variables
3x+(2x+20)-90=0
We get rid of parentheses
3x+2x+20-90=0
We add all the numbers together, and all the variables
5x-70=0
We move all terms containing x to the left, all other terms to the right
5x=70
x=70/5
x=14
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