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x² + x = 156
x² + x - 156 = 0 Factorizas trinomio de la forma x² + bx + c
(x + 13)(x - 12) = 0 Tiene como solución 2 raices reales
x + 13 = 0
x = - 13
o
x - 12 = 0
x = 12
Solución.
(- 13 , 12)