9x+15=8x+21

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Solution for 9x+15=8x+21 equation: 



9x+15=8x+21

We move all terms to the left:

9x+15-(8x+21)=0

We get rid of parentheses

9x-8x-21+15=0

We add all the numbers together, and all the variables

x-6=0

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

x=6

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