-84=8(k+9)+9(-8k+4)

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Solution for -84=8(k+9)+9(-8k+4) equation: 



-84=8(k+9)+9(-8k+4)

We move all terms to the left:

-84-(8(k+9)+9(-8k+4))=0



We calculate terms in parentheses: -(8(k+9)+9(-8k+4)), so:

8(k+9)+9(-8k+4)

We multiply parentheses

8k-72k+72+36

We add all the numbers together, and all the variables

-64k+108

Back to the equation:

-(-64k+108)



We get rid of parentheses

64k-108-84=0

We add all the numbers together, and all the variables

64k-192=0

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

64k=192

k=192/64

k=3

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