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Determining the Voltage for Capacitor

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Please see the attached file for diagram.

Question:
Determine Vc(t) for t>0. The voltage across the capacitor in figure just before the switch is changed is given below: Vc(0) = -7V
Io = 12mA
C = 0.55muF
R1 = 7kOhms
R2 = 3.3 kOhms

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The solution talks through the voltage problem conceptually, following a train of thought from beginning to the end conclusion and trying to anticipate and answer questions the reader might have along the way.

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This a very tricky question.

First remember that we deal with an ideal current source. If we have a closed loop then the current must be 12mA, no more no ...

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