Make x the subject of the formula
3t + x = 5c

x = 5c - 3t

Step-by-step explanation:

3t + x = 5c

subtract 3t from both sides to isolate x

3t + x = 5c

-3t          -3t

x = 5c - 3t

PCM: Pulse code modulation. It is a method used to digitally represent sampled analog signals. It is the standard form of digital audio in computers, digital telephony and compact discs. The amplitude of this signal is sampled regularly at uniform intervals.

PAM: Pulse amplitude modulation. It is a form of signal modulation where the message information is encoded in the amplitude of a series of signal pulses.