7x-21=3x+21

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



7x-21=3x+21

We move all terms to the left:

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

We get rid of parentheses

7x-3x-21-21=0

We add all the numbers together, and all the variables

4x-42=0

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

4x=42

x=42/4

x=10+1/2

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