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3(x-4)+9=18
We move all terms to the left:
3(x-4)+9-(18)=0
We add all the numbers together, and all the variables
3(x-4)-9=0
We multiply parentheses
3x-12-9=0
We add all the numbers together, and all the variables
3x-21=0
We move all terms containing x to the left, all other terms to the right
3x=21
x=21/3
x=7
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