7x-(3x-9)=21

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



7x-(3x-9)=21

We move all terms to the left:

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

We get rid of parentheses

7x-3x+9-21=0

We add all the numbers together, and all the variables

4x-12=0

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

4x=12

x=12/4

x=3

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