9x-21=6x-42

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Solution for 9x-21=6x-42 equation: 



9x-21=6x-42

We move all terms to the left:

9x-21-(6x-42)=0

We get rid of parentheses

9x-6x+42-21=0

We add all the numbers together, and all the variables

3x+21=0

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

3x=-21

x=-21/3

x=-7

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