2u+9=8u-21

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Solution for 2u+9=8u-21 equation: 



2u+9=8u-21

We move all terms to the left:

2u+9-(8u-21)=0

We get rid of parentheses

2u-8u+21+9=0

We add all the numbers together, and all the variables

-6u+30=0

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

-6u=-30

u=-30/-6

u=+5

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