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-2(k+83)=-40
We move all terms to the left:
-2(k+83)-(-40)=0
We add all the numbers together, and all the variables
-2(k+83)+40=0
We multiply parentheses
-2k-166+40=0
We add all the numbers together, and all the variables
-2k-126=0
We move all terms containing k to the left, all other terms to the right
-2k=126
k=126/-2
k=-63
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