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23k+10k+6k-29k-8k=40
We move all terms to the left:
23k+10k+6k-29k-8k-(40)=0
We add all the numbers together, and all the variables
2k-40=0
We move all terms containing k to the left, all other terms to the right
2k=40
k=40/2
k=20
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