u=9-20

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Solution for u=9-20 equation: 



u=9-20

We move all terms to the left:

u-(9-20)=0

We add all the numbers together, and all the variables

u-(-11)=0

We add all the numbers together, and all the variables

u+11=0

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

u=-11

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