Given the circuit information, we can calculate the current and voltages as follows:
IT = VT / (R1 + R2 + Ro)
I1 = IT
I2 = IT
RT = R1 + R2 + Ro
RT = 7 + 7 + 12 = 26 Ohms
So the total resistance of the circuit (RT) is 26 Ohms.
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