2u-21=2u-9

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Solution for 2u-21=2u-9 equation: 



2u-21=2u-9

We move all terms to the left:

2u-21-(2u-9)=0

We get rid of parentheses

2u-2u+9-21=0

We add all the numbers together, and all the variables

-12!=0

There is no solution for this equation

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