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3(-9+7x)=204
We move all terms to the left:
3(-9+7x)-(204)=0
We add all the numbers together, and all the variables
3(7x-9)-204=0
We multiply parentheses
21x-27-204=0
We add all the numbers together, and all the variables
21x-231=0
We move all terms containing x to the left, all other terms to the right
21x=231
x=231/21
x=11
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