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⇒ -5x² - 11x + 12 = 0
⇒ 5x² + 11x - 12 = 0
⇒ (5x - 4)(x + 3) = 0
⇒ 5x - 4 = 0 x + 3 = 0
5x = 4 ∨ x = -3
x =
jdi nilai x yg memenuhi adalah dan -3