a) (fog)(x) = (-8/x) / (-8/x) - 5 = -8 / -8-5x
b) (gof)(x) = -8/ x/x-5 = 40-8x / x
c) (fof)(x) = x/x-5 / (x/x-5)-5 = x / 25-4x
d) (gog)(x) = -8 / -8/x = x
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