2x+9=6x+21

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Solution for 2x+9=6x+21 equation: 



2x+9=6x+21

We move all terms to the left:

2x+9-(6x+21)=0

We get rid of parentheses

2x-6x-21+9=0

We add all the numbers together, and all the variables

-4x-12=0

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

-4x=12

x=12/-4

x=-3

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