If m is an integer such that (-2)^2m=2^(21-m) then m=?	Answers:
A) 5	B) 6	C) 7	D) 8	E) 9
2m = 21-m   3m = 21   m = 7   The answer is 7.
<result>C</result>
If m is an integer such that (-2)^2m=2^(21-m) then m=?