21k+20k-22k-8k-9k=78

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Solution for 21k+20k-22k-8k-9k=78 equation: 



21k+20k-22k-8k-9k=78

We move all terms to the left:

21k+20k-22k-8k-9k-(78)=0

We add all the numbers together, and all the variables

2k-78=0

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

2k=78

k=78/2

k=39

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