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5x - 2 (2x) = 25
5x - 4x = 25
x = 25
Metodo
Sustitucion.
5x - 2y = 25 (1)
y = 2x (2) Sustituimos este valor en (1)
5x - 2y = 25
5x - 2(2x) = 25
5x - 4x = 25
x = 25 Remplazo este valor en (2)
y = 2x
y = 2 * 25
y = 50
Solucion
(25 , 50)