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12-3(k-1)=48
We move all terms to the left:
12-3(k-1)-(48)=0
We add all the numbers together, and all the variables
-3(k-1)-36=0
We multiply parentheses
-3k+3-36=0
We add all the numbers together, and all the variables
-3k-33=0
We move all terms containing k to the left, all other terms to the right
-3k=33
k=33/-3
k=-11
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