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(x - 3)(x - 6) - 18 = 0 ------- D = R / { 0, 6)
x² - 6x - 3x + 18 - 18 = 0
x² - 9x = 0
x(x - 9) = 0
x = 0 ∉ D lub x = 9 ∈ D
odp. x = 9
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(x - 3)(x - 6) - 18 = 0 ------- D = R / { 0, 6)
x² - 6x - 3x + 18 - 18 = 0
x² - 9x = 0
x(x - 9) = 0
x = 0 ∉ D lub x = 9 ∈ D
odp. x = 9