Answer
10
Work Step by Step
We know that the sum of AX and XB is equal to AB. Thus, it follows:
$$ x+3 + x =3x -7 \\ 2x+3 = 3x-7 \\ x =10$$
Elementary Geometry for College Students (7th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Cengage
ISBN 10:
978-1-337-61408-5
ISBN 13:
978-1-33761-408-5
Chapter P - Preliminary Concepts - Chapter P Test - Page 30: 12
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