6x-21=9x-42

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



6x-21=9x-42

We move all terms to the left:

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

We get rid of parentheses

6x-9x+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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