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15k+21+6k-10=10k+55
We move all terms to the left:
15k+21+6k-10-(10k+55)=0
We add all the numbers together, and all the variables
21k-(10k+55)+11=0
We get rid of parentheses
21k-10k-55+11=0
We add all the numbers together, and all the variables
11k-44=0
We move all terms containing k to the left, all other terms to the right
11k=44
k=44/11
k=4
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