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Math·Algebra·Linear equations in one variable

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$c(x-6)=-7(x+k)$ In the given equation, $c$ and $k$ are constants. The equation has exactly one solution. Which of the following statements must be true?

A

The value of $c$ cannot be $-7$.

B

The value of $c$ cannot be $-\frac{7}{6}$.

C

The value of $k$ cannot be $\frac{6}{7}$.

D

The value of $k$ cannot be $-6$.