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-2(k-11)=40
We move all terms to the left:
-2(k-11)-(40)=0
We multiply parentheses
-2k+22-40=0
We add all the numbers together, and all the variables
-2k-18=0
We move all terms containing k to the left, all other terms to the right
-2k=18
k=18/-2
k=-9
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