A certain function f satisfies the equation f(x)+2*f(6-x) = x for all real numbers x. The value of f(1) is  Choose the correct choice from the following:
A) 2 B) 1 C) 3 D) 4 E) can't determine
f(1)+2*f(6-1)=1......... (1)   f(5)+2*f(6-5)=5......... (2)   substituting we have (2) in (1) we have :-   -3f(1)=-9,   hence answer f(1)=3.   ANSWER:3
<result>C</result>
A certain function f satisfies the equation f(x)+2*f(6-x) = x for all real numbers x. The value of f(1) is