-3-u=9u+7

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Solution for -3-u=9u+7 equation: 



-3-u=9u+7

We move all terms to the left:

-3-u-(9u+7)=0

We add all the numbers together, and all the variables

-1u-(9u+7)-3=0

We get rid of parentheses

-1u-9u-7-3=0

We add all the numbers together, and all the variables

-10u-10=0

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

-10u=10

u=10/-10

u=-1

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