(20a^2 - 25a + 5) / (8a^2 - 6a + 1) * (4a^2 - 1) / (5 + 20a - 25a^2)
(a - 1)(20a - 5) / (1 - 6a + 8a^2) * (2a - 1)(2a + 1) / (-1 + a)(-5 - 25a)
5(a - 1)(a - 1) / (1 - 2a)(1 - 4a) * (2a - 1)(2a + 1) / (-5)(a - 1)(5a + 1)
5(a - 1)(a - 1)(2a - 1)(2a + 1) / (1 - 2a)(1 - 4a)(-5)(a - 1)(5a + 1)
5(a - 1)(a - 1)(2a - 1)(2a + 1) / (-5)(-1)(2a - 1)(-1)(4a - 1)(a - 1)(5a + 1)
5(a - 1)(a - 1)(2a - 1)(2a + 1) / (-5)(2a - 1)(4a - 1)(a - 1)(5a + 1)
-(a - 1)(2a + 1) / (4a - 1)(5a + 1)
-(2a^2 + a - 2a - 1) / (20a^2 - 5a + 4a - 1)
-(2a^2 - a - 1) / (20a^2 - a - 1)
(-2a^2 + a + 1) / (20a^2 -a - 1)