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5x+3+6x=9x+9
We move all terms to the left:
5x+3+6x-(9x+9)=0
We add all the numbers together, and all the variables
11x-(9x+9)+3=0
We get rid of parentheses
11x-9x-9+3=0
We add all the numbers together, and all the variables
2x-6=0
We move all terms containing x to the left, all other terms to the right
2x=6
x=6/2
x=3
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