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Math·Geometry and Trigonometry·Lines, angles, and triangles

hard

Three parallel lines are cut by two transversals. On the first transversal, the consecutive segments between the parallel lines have lengths $x+3$ and $2x-1$. On the second transversal, the corresponding segments have lengths 12 and 20. What is the value of $x$?

A

12

B

15

C

18

D

21