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5(4k+5)=85
We move all terms to the left:
5(4k+5)-(85)=0
We multiply parentheses
20k+25-85=0
We add all the numbers together, and all the variables
20k-60=0
We move all terms containing k to the left, all other terms to the right
20k=60
k=60/20
k=3
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