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8 / x = (x - 2) / 15;
8 . 15 = x (x - 2)
120 = x² - 2 x; o bien: x² - 2 x - 120 = 0
Ecuación de segundo grado en x; sus raíces son x = 12, x = - 10
Las dos soluciones son posibles.
8 / 12 = (12 - 2) / 15; 8 / (-10) = (-10 -2) / 15
La suma: 12 + 12 - 2 = 22
-10 + -10 -2 = - 22
Saludos Herminio