-90=-6(8-7k)

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Solution for -90=-6(8-7k) equation: 



-90=-6(8-7k)

We move all terms to the left:

-90-(-6(8-7k))=0

We add all the numbers together, and all the variables

-(-6(-7k+8))-90=0



We calculate terms in parentheses: -(-6(-7k+8)), so:

-6(-7k+8)

We multiply parentheses

42k-48

Back to the equation:

-(42k-48)



We get rid of parentheses

-42k+48-90=0

We add all the numbers together, and all the variables

-42k-42=0

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

-42k=42

k=42/-42

k=-1

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