X=21-6x

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Solution for X=21-6x equation: 



X=21-6X

We move all terms to the left:

X-(21-6X)=0

We add all the numbers together, and all the variables

X-(-6X+21)=0

We get rid of parentheses

X+6X-21=0

We add all the numbers together, and all the variables

7X-21=0

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

7X=21

X=21/7

X=3

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