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12k+9.5=k+15
We move all terms to the left:
12k+9.5-(k+15)=0
We get rid of parentheses
12k-k-15+9.5=0
We add all the numbers together, and all the variables
11k-5.5=0
We move all terms containing k to the left, all other terms to the right
11k=5.5
k=5.5/11
k=3.66666666667/7.33333333333
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