-20=-5(u+9)

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Solution for -20=-5(u+9) equation: 



-20=-5(u+9)

We move all terms to the left:

-20-(-5(u+9))=0



We calculate terms in parentheses: -(-5(u+9)), so:

-5(u+9)

We multiply parentheses

-5u-45

Back to the equation:

-(-5u-45)



We get rid of parentheses

5u+45-20=0

We add all the numbers together, and all the variables

5u+25=0

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

5u=-25

u=-25/5

u=-5

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