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)=0

We add all the numbers together, and all the variables

-6u+9=0

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

-6u=-9

u=-9/-6

u=1+1/2

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