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15=3k+3
We move all terms to the left:
15-(3k+3)=0
We get rid of parentheses
-3k-3+15=0
We add all the numbers together, and all the variables
-3k+12=0
We move all terms containing k to the left, all other terms to the right
-3k=-12
k=-12/-3
k=+4
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