84=4(9+k)

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



84=4(9+k)

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



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

4(k+9)

We multiply parentheses

4k+36

Back to the equation:

-(4k+36)



We get rid of parentheses

-4k-36+84=0

We add all the numbers together, and all the variables

-4k+48=0

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

-4k=-48

k=-48/-4

k=+12

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