-90=-5(3+3k)

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Solution for -90=-5(3+3k) equation: 



-90=-5(3+3k)

We move all terms to the left:

-90-(-5(3+3k))=0

We add all the numbers together, and all the variables

-(-5(3k+3))-90=0



We calculate terms in parentheses: -(-5(3k+3)), so:

-5(3k+3)

We multiply parentheses

-15k-15

Back to the equation:

-(-15k-15)



We get rid of parentheses

15k+15-90=0

We add all the numbers together, and all the variables

15k-75=0

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

15k=75

k=75/15

k=5

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