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-7(k+5)=-91
We move all terms to the left:
-7(k+5)-(-91)=0
We add all the numbers together, and all the variables
-7(k+5)+91=0
We multiply parentheses
-7k-35+91=0
We add all the numbers together, and all the variables
-7k+56=0
We move all terms containing k to the left, all other terms to the right
-7k=-56
k=-56/-7
k=+8
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