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x+2x+(x+3)=99
We move all terms to the left:
x+2x+(x+3)-(99)=0
We add all the numbers together, and all the variables
3x+(x+3)-99=0
We get rid of parentheses
3x+x+3-99=0
We add all the numbers together, and all the variables
4x-96=0
We move all terms containing x to the left, all other terms to the right
4x=96
x=96/4
x=24
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