3x+21=9x-9

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Solution for 3x+21=9x-9 equation: 



3x+21=9x-9

We move all terms to the left:

3x+21-(9x-9)=0

We get rid of parentheses

3x-9x+9+21=0

We add all the numbers together, and all the variables

-6x+30=0

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

-6x=-30

x=-30/-6

x=+5

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