6x+9=21+9x

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



6x+9=21+9x

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

6x-9x-21+9=0

We add all the numbers together, and all the variables

-3x-12=0

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

-3x=12

x=12/-3

x=-4

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