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5(4k-2)=40
We move all terms to the left:
5(4k-2)-(40)=0
We multiply parentheses
20k-10-40=0
We add all the numbers together, and all the variables
20k-50=0
We move all terms containing k to the left, all other terms to the right
20k=50
k=50/20
k=2+1/2
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