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4(4k+1)=20
We move all terms to the left:
4(4k+1)-(20)=0
We multiply parentheses
16k+4-20=0
We add all the numbers together, and all the variables
16k-16=0
We move all terms containing k to the left, all other terms to the right
16k=16
k=16/16
k=1
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