8x-21=21-6x

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Solution for 8x-21=21-6x equation: 



8x-21=21-6x

We move all terms to the left:

8x-21-(21-6x)=0

We add all the numbers together, and all the variables

8x-(-6x+21)-21=0

We get rid of parentheses

8x+6x-21-21=0

We add all the numbers together, and all the variables

14x-42=0

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

14x=42

x=42/14

x=3

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