9-7x=3x-21

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Solution for 9-7x=3x-21 equation: 



9-7x=3x-21

We move all terms to the left:

9-7x-(3x-21)=0

We get rid of parentheses

-7x-3x+21+9=0

We add all the numbers together, and all the variables

-10x+30=0

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

-10x=-30

x=-30/-10

x=+3

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