7u-21-u=-9

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Solution for 7u-21-u=-9 equation: 



7u-21-u=-9

We move all terms to the left:

7u-21-u-(-9)=0

We add all the numbers together, and all the variables

6u-12=0

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

6u=12

u=12/6

u=2

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