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8(1+8k)=-120
We move all terms to the left:
8(1+8k)-(-120)=0
We add all the numbers together, and all the variables
8(8k+1)-(-120)=0
We add all the numbers together, and all the variables
8(8k+1)+120=0
We multiply parentheses
64k+8+120=0
We add all the numbers together, and all the variables
64k+128=0
We move all terms containing k to the left, all other terms to the right
64k=-128
k=-128/64
k=-2
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