Given 2x + y + z = 3 and 5x + 3y + z = 15, what is the value of x + y - z?	Options:
A) 5  B) 6  C) 7  D) 8  E) 9
(1) 5x + 3y + z = 15   If 2x + y + z = 3, then (2) 4x + 2y + 2z = 6   Let's subtract equation (2) for equation (1).   x + y - z = 9   The answer is 9.
<result>E</result>
Given 2x + y + z = 3 and 5x + 3y + z = 15, what is the value of x + y - z?