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12k-4=10k-15
We move all terms to the left:
12k-4-(10k-15)=0
We get rid of parentheses
12k-10k+15-4=0
We add all the numbers together, and all the variables
2k+11=0
We move all terms containing k to the left, all other terms to the right
2k=-11
k=-11/2
k=-5+1/2
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