2u-21=u-2

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



2u-21=u-2

We move all terms to the left:

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

We get rid of parentheses

2u-u+2-21=0

We add all the numbers together, and all the variables

u-19=0

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

u=19

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