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8(k+3)+4k=84
We move all terms to the left:
8(k+3)+4k-(84)=0
We add all the numbers together, and all the variables
4k+8(k+3)-84=0
We multiply parentheses
4k+8k+24-84=0
We add all the numbers together, and all the variables
12k-60=0
We move all terms containing k to the left, all other terms to the right
12k=60
k=60/12
k=5
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