u+9u=-20

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Solution for u+9u=-20 equation: 



u+9u=-20

We move all terms to the left:

u+9u-(-20)=0

We add all the numbers together, and all the variables

10u+20=0

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

10u=-20

u=-20/10

u=-2

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