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(x+3)+x=33
We move all terms to the left:
(x+3)+x-(33)=0
We add all the numbers together, and all the variables
x+(x+3)-33=0
We get rid of parentheses
x+x+3-33=0
We add all the numbers together, and all the variables
2x-30=0
We move all terms containing x to the left, all other terms to the right
2x=30
x=30/2
x=15
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