9x+9x+3x=21

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



9x+9x+3x=21

We move all terms to the left:

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

We add all the numbers together, and all the variables

21x-21=0

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

21x=21

x=21/21

x=1

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