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(x+33)+2x=90
We move all terms to the left:
(x+33)+2x-(90)=0
We add all the numbers together, and all the variables
2x+(x+33)-90=0
We get rid of parentheses
2x+x+33-90=0
We add all the numbers together, and all the variables
3x-57=0
We move all terms containing x to the left, all other terms to the right
3x=57
x=57/3
x=19
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