Solve for k
k=0
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-4+14k=-4-7k
Combine 6k and 8k to get 14k.
-4+14k+7k=-4
Add 7k to both sides.
-4+21k=-4
Combine 14k and 7k to get 21k.
21k=-4+4
Add 4 to both sides.
21k=0
Add -4 and 4 to get 0.
k=0
Product of two numbers is equal to 0 if at least one of them is 0. Since 21 is not equal to 0, k must be equal to 0.
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