3x=21-6x

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Solution for 3x=21-6x equation: 



3x=21-6x

We move all terms to the left:

3x-(21-6x)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

3x+6x-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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