6x+6x=3x+21

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Solution for 6x+6x=3x+21 equation: 



6x+6x=3x+21

We move all terms to the left:

6x+6x-(3x+21)=0

We add all the numbers together, and all the variables

12x-(3x+21)=0

We get rid of parentheses

12x-3x-21=0

We add all the numbers together, and all the variables

9x-21=0

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

9x=21

x=21/9

x=2+1/3

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