9=5u+8(u-7)

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Solution for 9=5u+8(u-7) equation: 



9=5u+8(u-7)

We move all terms to the left:

9-(5u+8(u-7))=0



We calculate terms in parentheses: -(5u+8(u-7)), so:

5u+8(u-7)

We multiply parentheses

5u+8u-56

We add all the numbers together, and all the variables

13u-56

Back to the equation:

-(13u-56)



We get rid of parentheses

-13u+56+9=0

We add all the numbers together, and all the variables

-13u+65=0

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

-13u=-65

u=-65/-13

u=+5

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