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Francirlei
Estudo de Caso
y = 12 - x² e y = x - 6
x² = x - 6
x² - x - 6 = 0
(x - 3)(x + 2) = 0
x = 3 ou x = -2
y = 12 - 3² = 3 e y = 12 - (-2)² = 8
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