u+9+2=-u-9

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Solution for u+9+2=-u-9 equation: 



u+9+2=-u-9

We move all terms to the left:

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

We add all the numbers together, and all the variables

u-(-1u-9)+9+2=0

We add all the numbers together, and all the variables

u-(-1u-9)+11=0

We get rid of parentheses

u+1u+9+11=0

We add all the numbers together, and all the variables

2u+20=0

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

2u=-20

u=-20/2

u=-10

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