2x-9=8x+21

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Solution for 2x-9=8x+21 equation: 



2x-9=8x+21

We move all terms to the left:

2x-9-(8x+21)=0

We get rid of parentheses

2x-8x-21-9=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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