I know how to find out the probability within a given range on the normal distribution curve, but a textbook suddenly asked about finding the mean.

There's an unknown mean and a standard deviation of 0.6. I have to calculate the mean if the values after 5.7 have a probability of 0.14.

The answer is obviously provided in the textbook, but that's all there is. A step-by-step procedure would be awesome. Thanks in advance.