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-7(k+4)-(-8k-7)=-8
We move all terms to the left:
-7(k+4)-(-8k-7)-(-8)=0
We add all the numbers together, and all the variables
-7(k+4)-(-8k-7)+8=0
We multiply parentheses
-7k-(-8k-7)-28+8=0
We get rid of parentheses
-7k+8k+7-28+8=0
We add all the numbers together, and all the variables
k-13=0
We move all terms containing k to the left, all other terms to the right
k=13
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