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=0

x=0/4

x=0

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