8x+21=x+21

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Solution for 8x+21=x+21 equation: 



8x+21=x+21

We move all terms to the left:

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

We get rid of parentheses

8x-x-21+21=0

We add all the numbers together, and all the variables

7x=0

x=0/7

x=0

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