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-10k-7=-9k+2
We move all terms to the left:
-10k-7-(-9k+2)=0
We get rid of parentheses
-10k+9k-2-7=0
We add all the numbers together, and all the variables
-1k-9=0
We move all terms containing k to the left, all other terms to the right
-k=9
k=9/-1
k=-9
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