7x+21=7x-28

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Solution for 7x+21=7x-28 equation: 



7x+21=7x-28

We move all terms to the left:

7x+21-(7x-28)=0

We get rid of parentheses

7x-7x+28+21=0

We add all the numbers together, and all the variables

49!=0

There is no solution for this equation

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