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4k=-81/4
We move all terms to the left:
4k-(-81/4)=0
We get rid of parentheses
4k+81/4=0
We multiply all the terms by the denominator
4k*4+81=0
Wy multiply elements
16k+81=0
We move all terms containing k to the left, all other terms to the right
16k=-81
k=-81/16
k=-5+1/16
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