91=7(-8-3k)

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Solution for 91=7(-8-3k) equation: 



91=7(-8-3k)

We move all terms to the left:

91-(7(-8-3k))=0

We add all the numbers together, and all the variables

-(7(-3k-8))+91=0



We calculate terms in parentheses: -(7(-3k-8)), so:

7(-3k-8)

We multiply parentheses

-21k-56

Back to the equation:

-(-21k-56)



We get rid of parentheses

21k+56+91=0

We add all the numbers together, and all the variables

21k+147=0

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

21k=-147

k=-147/21

k=-7

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