6x-21=3x+6

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Solution for 6x-21=3x+6 equation: 



6x-21=3x+6

We move all terms to the left:

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

We get rid of parentheses

6x-3x-6-21=0

We add all the numbers together, and all the variables

3x-27=0

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

3x=27

x=27/3

x=9

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