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k(4k+9)=4k^2+
We move all terms to the left:
k(4k+9)-(4k^2+)=0
We multiply parentheses
4k^2+9k-(4k^2+)=0
We get rid of parentheses
4k^2-4k^2+9k-=0
We add all the numbers together, and all the variables
9k=0
k=0/9
k=0
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