(a - 4)(a - 2) - (a - 1)(a - 3) = a² - 2a - 4a + 8 - (a² - 3a - a + 3) =
= a² - 2a - 4a + 8 - a² + 3a + a - 3 = - 2a + 5
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(a - 4)(a - 2) - (a - 1)(a - 3) = a² - 2a - 4a + 8 - (a² - 3a - a + 3) =
= a² - 2a - 4a + 8 - a² + 3a + a - 3 = - 2a + 5