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7k+3k=-20-60
We move all terms to the left:
7k+3k-(-20-60)=0
We add all the numbers together, and all the variables
7k+3k-(-80)=0
We add all the numbers together, and all the variables
10k+80=0
We move all terms containing k to the left, all other terms to the right
10k=-80
k=-80/10
k=-8
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