u+u+u+6=21

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Solution for u+u+u+6=21 equation: 



u+u+u+6=21

We move all terms to the left:

u+u+u+6-(21)=0

We add all the numbers together, and all the variables

3u-15=0

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

3u=15

u=15/3

u=5

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