x+5/x-2+x-2/x+5=..................

misal : a = x+5
b = x-2

berarti :
a/b + b/a = (a²+b²)/ab
= ((x+5)² + (x-2)²)/((x+5)(x-2))
= (x²+10x+25+x²-4x+4)/ ((x+5)(x-2))
= (2x²+6x+29)/((x+5)(x-2))
C