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48=3k+12
We move all terms to the left:
48-(3k+12)=0
We get rid of parentheses
-3k-12+48=0
We add all the numbers together, and all the variables
-3k+36=0
We move all terms containing k to the left, all other terms to the right
-3k=-36
k=-36/-3
k=+12
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