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f(-3)=-2 ... -2 = -3m+n
f(5)=22 ....22 = 5m+n
------------------------------ (-)
24 = 8m .... m=3
-2 = -3 (3)+n ...... n=7
f(-2)+f(3) = 3(-2) + 7 + 3(3)+7= 17
1/3,2/4.3/5,4/6,.....
Un= n/(n+2)