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(x+2x=33)
We move all terms to the left:
(x+2x-(33))=0
We add all the numbers together, and all the variables
(3x-33)=0
We get rid of parentheses
3x-33=0
We move all terms containing x to the left, all other terms to the right
3x=33
x=33/3
x=11
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