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-5(k+8)=-31-2k
We move all terms to the left:
-5(k+8)-(-31-2k)=0
We add all the numbers together, and all the variables
-5(k+8)-(-2k-31)=0
We multiply parentheses
-5k-(-2k-31)-40=0
We get rid of parentheses
-5k+2k+31-40=0
We add all the numbers together, and all the variables
-3k-9=0
We move all terms containing k to the left, all other terms to the right
-3k=9
k=9/-3
k=-3
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