7x-21=3x+9

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



7x-21=3x+9

We move all terms to the left:

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

We get rid of parentheses

7x-3x-9-21=0

We add all the numbers together, and all the variables

4x-30=0

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

4x=30

x=30/4

x=7+1/2

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