7u+1=9u-9

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Solution for 7u+1=9u-9 equation: 



7u+1=9u-9

We move all terms to the left:

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

We get rid of parentheses

7u-9u+9+1=0

We add all the numbers together, and all the variables

-2u+10=0

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

-2u=-10

u=-10/-2

u=+5

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