Answer
$$c^{6}d^{8}$$
Work Step by Step
To divide powers of the same base, subtract the exponents:
$$\frac{c^{3}d^{7}}{c^{-3}d^{-1}}=c^{3-(-3)}d^{7-(-1)}=c^{3+3}d^{7+1}=c^{6}d^{8}.$$
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