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91=4k-19
We move all terms to the left:
91-(4k-19)=0
We get rid of parentheses
-4k+19+91=0
We add all the numbers together, and all the variables
-4k+110=0
We move all terms containing k to the left, all other terms to the right
-4k=-110
k=-110/-4
k=27+1/2
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