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7x² + 28x = 0 Factorizas sacas factor comun 7x
7x(x + 4) = 0 Tiene como solucion 2 raices reales
7x = 0
x = 0/7
x = 0
o
x + 4 = 0
x = - 4
Solucion
(0 , - 4)