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3(3x+6)=9
We move all terms to the left:
3(3x+6)-(9)=0
We multiply parentheses
9x+18-9=0
We add all the numbers together, and all the variables
9x+9=0
We move all terms containing x to the left, all other terms to the right
9x=-9
x=-9/9
x=-1
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