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9=4-8k
We move all terms to the left:
9-(4-8k)=0
We add all the numbers together, and all the variables
-(-8k+4)+9=0
We get rid of parentheses
8k-4+9=0
We add all the numbers together, and all the variables
8k+5=0
We move all terms containing k to the left, all other terms to the right
8k=-5
k=-5/8
k=-5/8
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