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-7(7+k)=56
We move all terms to the left:
-7(7+k)-(56)=0
We add all the numbers together, and all the variables
-7(k+7)-56=0
We multiply parentheses
-7k-49-56=0
We add all the numbers together, and all the variables
-7k-105=0
We move all terms containing k to the left, all other terms to the right
-7k=105
k=105/-7
k=-15
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