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2k+15=11k-12
We move all terms to the left:
2k+15-(11k-12)=0
We get rid of parentheses
2k-11k+12+15=0
We add all the numbers together, and all the variables
-9k+27=0
We move all terms containing k to the left, all other terms to the right
-9k=-27
k=-27/-9
k=+3
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