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Pepe = y
pablo + pepe = 75
x+y = 75
Ademas
2x - (y+68) = 40
2x-y-68 = 40
2x-y = 40+68
2x-y = 108
Ahora
x+y = 75 ........... (I)
2x-y =108 .........(II)
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3x = 183
x = 183/3
x = 61 = edad de Pablo