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3x+7=9-3x
We move all terms to the left:
3x+7-(9-3x)=0
We add all the numbers together, and all the variables
3x-(-3x+9)+7=0
We get rid of parentheses
3x+3x-9+7=0
We add all the numbers together, and all the variables
6x-2=0
We move all terms containing x to the left, all other terms to the right
6x=2
x=2/6
x=1/3
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