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= a - 4 / 5 (a + 4) (a - 4)
= 1 / 5(a + 4)
= 1 / 5a + 20
a / a² - 16 x a- 4 / 5a = a(a - 4) / 5a(a² - 16)
= a - 4 / 5 (a + 4) (a - 4)
= 1 / 5(a + 4)
= 1 / 5a + 20