It does add up to 24 volts, so my next step is subtract the voltage drops starting with +12 volts!Hint:
The total voltage around the loop is 24 Volts
The total resistance around the loop is 18 K Ohms
Therefore the current in the loop is 1.333... mA
Apply Ohms law to each resistor and compute the voltage drop. The three voltage drops should add up to 24. So starting with +12 Volts subtract the voltage drops until you get to -12 volts.
Are you with me?
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by Jake Hertz