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2k-10=12k+90
We move all terms to the left:
2k-10-(12k+90)=0
We get rid of parentheses
2k-12k-90-10=0
We add all the numbers together, and all the variables
-10k-100=0
We move all terms containing k to the left, all other terms to the right
-10k=100
k=100/-10
k=-10
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