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## Homework Statement

http://www.chegg.com/homework-help/...adjusted-va-equals-60-v-find-value-r-q8083343

## Homework Equations

## The Attempt at a Solution

Hi, I attached a pdf file with the problem. My question is, for the lower right loop, why is the equation that they have valid? I worked the problem, but the equation that I got for that loop is...

voltage of 180 ohm + voltage of 30 ohm + voltage of 12 ohm + voltage of 18 ohm =0. so the voltage for the 180ohm, is -180V, but they have a positive 180V. How did they got that?