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12k+15=35+21
We move all terms to the left:
12k+15-(35+21)=0
We add all the numbers together, and all the variables
12k+15-56=0
We add all the numbers together, and all the variables
12k-41=0
We move all terms containing k to the left, all other terms to the right
12k=41
k=41/12
k=3+5/12
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