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6+9x=18+6x
We move all terms to the left:
6+9x-(18+6x)=0
We add all the numbers together, and all the variables
9x-(6x+18)+6=0
We get rid of parentheses
9x-6x-18+6=0
We add all the numbers together, and all the variables
3x-12=0
We move all terms containing x to the left, all other terms to the right
3x=12
x=12/3
x=4
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