6x-21=x+9

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Solution for 6x-21=x+9 equation: 



6x-21=x+9

We move all terms to the left:

6x-21-(x+9)=0

We get rid of parentheses

6x-x-9-21=0

We add all the numbers together, and all the variables

5x-30=0

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

5x=30

x=30/5

x=6

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