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12k+3(k+5)=48
We move all terms to the left:
12k+3(k+5)-(48)=0
We multiply parentheses
12k+3k+15-48=0
We add all the numbers together, and all the variables
15k-33=0
We move all terms containing k to the left, all other terms to the right
15k=33
k=33/15
k=2+1/5
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