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73+(9k+8)=90
We move all terms to the left:
73+(9k+8)-(90)=0
We add all the numbers together, and all the variables
(9k+8)-17=0
We get rid of parentheses
9k+8-17=0
We add all the numbers together, and all the variables
9k-9=0
We move all terms containing k to the left, all other terms to the right
9k=9
k=9/9
k=1
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