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7-54.

The figures below are similar. Use the information given about the lengths of the sides to solve for and .  

A quadrilateral with sides labeled, starting at the top and going clockwise, as follows: y, 9, 12 and 6.

A larger quadrilateral, in the same orientation, with sides labeled, starting at the top and going clockwise, as follows: 15, x, 20, and 10.

Use proportions to solve for and .