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18k-91=4k+35
We move all terms to the left:
18k-91-(4k+35)=0
We get rid of parentheses
18k-4k-35-91=0
We add all the numbers together, and all the variables
14k-126=0
We move all terms containing k to the left, all other terms to the right
14k=126
k=126/14
k=9
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