-91=-7(5-k)

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Solution for -91=-7(5-k) equation: 



-91=-7(5-k)

We move all terms to the left:

-91-(-7(5-k))=0

We add all the numbers together, and all the variables

-(-7(-1k+5))-91=0



We calculate terms in parentheses: -(-7(-1k+5)), so:

-7(-1k+5)

We multiply parentheses

7k-35

Back to the equation:

-(7k-35)



We get rid of parentheses

-7k+35-91=0

We add all the numbers together, and all the variables

-7k-56=0

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

-7k=56

k=56/-7

k=-8

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