Question

x²-7x=0

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Answer 1

    x² - 7x = 0 ⇔

⇔ x × (x - 7) = 0 ⇔

⇔ x = 0  ∨  x - 7 = 0 ⇔

⇔ x = 0  ∨  x = 7

x ∈ {0 ; 7}