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8(2k+3)=40
We move all terms to the left:
8(2k+3)-(40)=0
We multiply parentheses
16k+24-40=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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