7x-21=9x-7

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Solution for 7x-21=9x-7 equation: 



7x-21=9x-7

We move all terms to the left:

7x-21-(9x-7)=0

We get rid of parentheses

7x-9x+7-21=0

We add all the numbers together, and all the variables

-2x-14=0

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

-2x=14

x=14/-2

x=-7

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