(u+9)2=21

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Solution for (u+9)2=21 equation: 



(u+9)2=21

We move all terms to the left:

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

We multiply parentheses

2u+18-21=0

We add all the numbers together, and all the variables

2u-3=0

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

2u=3

u=3/2

u=1+1/2

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