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4k-7(1+4k)=89
We move all terms to the left:
4k-7(1+4k)-(89)=0
We add all the numbers together, and all the variables
4k-7(4k+1)-89=0
We multiply parentheses
4k-28k-7-89=0
We add all the numbers together, and all the variables
-24k-96=0
We move all terms containing k to the left, all other terms to the right
-24k=96
k=96/-24
k=-4
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