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-12+10k=-9k+16k+18
We move all terms to the left:
-12+10k-(-9k+16k+18)=0
We add all the numbers together, and all the variables
10k-(7k+18)-12=0
We get rid of parentheses
10k-7k-18-12=0
We add all the numbers together, and all the variables
3k-30=0
We move all terms containing k to the left, all other terms to the right
3k=30
k=30/3
k=10
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