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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