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(3+x)+2x=30
We move all terms to the left:
(3+x)+2x-(30)=0
We add all the numbers together, and all the variables
(x+3)+2x-30=0
We add all the numbers together, and all the variables
2x+(x+3)-30=0
We get rid of parentheses
2x+x+3-30=0
We add all the numbers together, and all the variables
3x-27=0
We move all terms containing x to the left, all other terms to the right
3x=27
x=27/3
x=9
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