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-3-8k=-10k+7
We move all terms to the left:
-3-8k-(-10k+7)=0
We get rid of parentheses
-8k+10k-7-3=0
We add all the numbers together, and all the variables
2k-10=0
We move all terms containing k to the left, all other terms to the right
2k=10
k=10/2
k=5
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