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(2x+x)+(x+10)=90
We move all terms to the left:
(2x+x)+(x+10)-(90)=0
We add all the numbers together, and all the variables
(+3x)+(x+10)-90=0
We get rid of parentheses
3x+x+10-90=0
We add all the numbers together, and all the variables
4x-80=0
We move all terms containing x to the left, all other terms to the right
4x=80
x=80/4
x=20
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