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4+4-8k=-20+4
We move all terms to the left:
4+4-8k-(-20+4)=0
We add all the numbers together, and all the variables
-8k+4+4-(-16)=0
We add all the numbers together, and all the variables
-8k+24=0
We move all terms containing k to the left, all other terms to the right
-8k=-24
k=-24/-8
k=+3
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