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10k+7=-3-10
We move all terms to the left:
10k+7-(-3-10)=0
We add all the numbers together, and all the variables
10k+7-(-13)=0
We add all the numbers together, and all the variables
10k+20=0
We move all terms containing k to the left, all other terms to the right
10k=-20
k=-20/10
k=-2
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