8x+13=9x-21

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Solution for 8x+13=9x-21 equation: 



8x+13=9x-21

We move all terms to the left:

8x+13-(9x-21)=0

We get rid of parentheses

8x-9x+21+13=0

We add all the numbers together, and all the variables

-1x+34=0

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

-x=-34

x=-34/-1

x=+34

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