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Just as an aside: If you're having trouble with problems like this, I HIGHLY recommend going to your professor (I assume you're in college?) and asking for help NOW. Make SURE you understand this stuff thoroughly because it gets much, much harder after this. Once you get to capacitors, inductors, and the dreaded op amps, if you can't do simple resistor work, then you're basically screwed.
I remember one circuits midterm I had... it was out of 100 points and the class average was a 54. I got below average because I lost 50 points on one problem due to a very simple error in resistor work at the very beginning.
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