5u=8u-21

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Solution for 5u=8u-21 equation: 



5u=8u-21

We move all terms to the left:

5u-(8u-21)=0

We get rid of parentheses

5u-8u+21=0

We add all the numbers together, and all the variables

-3u+21=0

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

-3u=-21

u=-21/-3

u=+7

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