78=84-k

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Solution for 78=84-k equation: 



78=84-k

We move all terms to the left:

78-(84-k)=0

We add all the numbers together, and all the variables

-(-1k+84)+78=0

We get rid of parentheses

1k-84+78=0

We add all the numbers together, and all the variables

k-6=0

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

k=6

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