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x /(300 - x) = 4
x = 4 (300 - x)
x = 1200 - 4x
x + 4x = 1200
5x = 1200
x = 1200/5
x = 240
Los números son 240 y 60
Prueba
240 + 60 = 300
240 ÷ 60 = 4