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-4=10k-12=-3-39
We move all terms to the left:
-4-(10k-12)=0
We get rid of parentheses
-10k+12-4=0
We add all the numbers together, and all the variables
-10k+8=0
We move all terms containing k to the left, all other terms to the right
-10k=-8
k=-8/-10
k=4/5
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