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6=k3^2+30-9
We move all terms to the left:
6-(k3^2+30-9)=0
We get rid of parentheses
-k3^2-30+9+6=0
We add all the numbers together, and all the variables
-k3^2-15=0
We move all terms containing k to the left, all other terms to the right
-k3^2=15
k=15/1
k=15
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