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5(1+2k)-1=84
We move all terms to the left:
5(1+2k)-1-(84)=0
We add all the numbers together, and all the variables
5(2k+1)-1-84=0
We add all the numbers together, and all the variables
5(2k+1)-85=0
We multiply parentheses
10k+5-85=0
We add all the numbers together, and all the variables
10k-80=0
We move all terms containing k to the left, all other terms to the right
10k=80
k=80/10
k=8
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