15x-21=9x+21

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



15x-21=9x+21

We move all terms to the left:

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

We get rid of parentheses

15x-9x-21-21=0

We add all the numbers together, and all the variables

6x-42=0

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

6x=42

x=42/6

x=7

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