
Arturo O. answered 10/01/17
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(x - 5)(x - 4) = 0
Then either (x - 5) = 0 or (x - 4) = 0 or both.
x - 5 = 0 ⇒ x = 5
x - 4 = 0 ⇒ x = 4
Your solution set for x is {4,5}.