7x-9=8x+21

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Solution for 7x-9=8x+21 equation: 



7x-9=8x+21

We move all terms to the left:

7x-9-(8x+21)=0

We get rid of parentheses

7x-8x-21-9=0

We add all the numbers together, and all the variables

-1x-30=0

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

-x=30

x=30/-1

x=-30

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