3x+9+3x=21

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Solution for 3x+9+3x=21 equation: 



3x+9+3x=21

We move all terms to the left:

3x+9+3x-(21)=0

We add all the numbers together, and all the variables

6x-12=0

We move all terms containing x to the left, all other terms to the right

6x=12

x=12/6

x=2

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