11=u+7=9

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Solution for 11=u+7=9 equation: 



11=u+7=9

We move all terms to the left:

11-(u+7)=0

We get rid of parentheses

-u-7+11=0

We add all the numbers together, and all the variables

-1u+4=0

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

-u=-4

u=-4/-1

u=+4

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