Final answer:
The original entry for the purchase of the machine would be a debit of $24,000 to Machine and a credit of $24,000 to Cash.
Step-by-step explanation:
The original entry for the purchase of the machine on December 7 for $24,000 cash would be to record an increase in the machine's value and a decrease in cash. This is done through the following journal entry:
Debit: Machine $24,000
Credit: Cash $24,000
This entry recognizes the acquisition of the machine as an asset and the outflow of cash to pay for it.