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21k-6+7=-104
Use the distributive property to multiply 3 by 7k-2.
21k+1=-104
Add -6 and 7 to get 1.
21k=-104-1
Subtract 1 from both sides.
21k=-105
Subtract 1 from -104 to get -105.
k=\frac{-105}{21}
Divide both sides by 21.
k=-5
Divide -105 by 21 to get -5.