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-4(k+1)=20
We move all terms to the left:
-4(k+1)-(20)=0
We multiply parentheses
-4k-4-20=0
We add all the numbers together, and all the variables
-4k-24=0
We move all terms containing k to the left, all other terms to the right
-4k=24
k=24/-4
k=-6
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