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10k+1+8k+2=10k+11k
We move all terms to the left:
10k+1+8k+2-(10k+11k)=0
We add all the numbers together, and all the variables
10k+8k-(+21k)+1+2=0
We add all the numbers together, and all the variables
18k-(+21k)+3=0
We get rid of parentheses
18k-21k+3=0
We add all the numbers together, and all the variables
-3k+3=0
We move all terms containing k to the left, all other terms to the right
-3k=-3
k=-3/-3
k=1
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