21x-13=21x-4

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Solution for 21x-13=21x-4 equation: 



21x-13=21x-4

We move all terms to the left:

21x-13-(21x-4)=0

We get rid of parentheses

21x-21x+4-13=0

We add all the numbers together, and all the variables

-9!=0

There is no solution for this equation

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