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-20=2k+-12
We move all terms to the left:
-20-(2k+-12)=0
We add all the numbers together, and all the variables
-(2k-12)-20=0
We get rid of parentheses
-2k+12-20=0
We add all the numbers together, and all the variables
-2k-8=0
We move all terms containing k to the left, all other terms to the right
-2k=8
k=8/-2
k=-4
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