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42=6k+3
We move all terms to the left:
42-(6k+3)=0
We get rid of parentheses
-6k-3+42=0
We add all the numbers together, and all the variables
-6k+39=0
We move all terms containing k to the left, all other terms to the right
-6k=-39
k=-39/-6
k=6+1/2
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