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3+20(k+1)=3k+6
We move all terms to the left:
3+20(k+1)-(3k+6)=0
We multiply parentheses
20k-(3k+6)+20+3=0
We get rid of parentheses
20k-3k-6+20+3=0
We add all the numbers together, and all the variables
17k+17=0
We move all terms containing k to the left, all other terms to the right
17k=-17
k=-17/17
k=-1
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