13x-9=8x-21

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



13x-9=8x-21

We move all terms to the left:

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

We get rid of parentheses

13x-8x+21-9=0

We add all the numbers together, and all the variables

5x+12=0

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

5x=-12

x=-12/5

x=-2+2/5

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