9+x=7x-21

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



9+x=7x-21

We move all terms to the left:

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

We get rid of parentheses

x-7x+21+9=0

We add all the numbers together, and all the variables

-6x+30=0

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

-6x=-30

x=-30/-6

x=+5

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