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21x² = 7x
21x² - 7x = 0 Factorizas sacas factor comun 7x
7x(3x - 1) = 0 Tiene dos soluciones reales
7x = 0
x = 0/7
x = 0
o
3x - 1 = 0
3x = 1
x = 1/3
Solucion.
(0 , 1/3)