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83k+4=42k-1
We move all terms to the left:
83k+4-(42k-1)=0
We get rid of parentheses
83k-42k+1+4=0
We add all the numbers together, and all the variables
41k+5=0
We move all terms containing k to the left, all other terms to the right
41k=-5
k=-5/41
k=-5/41
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