Given f(x) = 2x – 3, for what value of x does 2*[f(x)] – 21 = f(x – 4) ?	Pick:
A) 0	B) 2	C) 4	D) 6	E) 8
2(2x-3)-21 = 2(x-4) - 3   2x = 16   x = 8   The answer is 8.
<result>E</result>
Given f(x) = 2x – 3, for what value of x does 2*[f(x)] – 21 = f(x – 4) ?