21+6x=9x-6

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



21+6x=9x-6

We move all terms to the left:

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

We get rid of parentheses

6x-9x+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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