8x-9=9x-21

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



8x-9=9x-21

We move all terms to the left:

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

We get rid of parentheses

8x-9x+21-9=0

We add all the numbers together, and all the variables

-1x+12=0

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

-x=-12

x=-12/-1

x=+12

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