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-4(10k+5)=k
We move all terms to the left:
-4(10k+5)-(k)=0
We add all the numbers together, and all the variables
-1k-4(10k+5)=0
We multiply parentheses
-1k-40k-20=0
We add all the numbers together, and all the variables
-41k-20=0
We move all terms containing k to the left, all other terms to the right
-41k=20
k=20/-41
k=-20/41
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