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3x+6=75
3x=75-6
3x=69
x=23
23+4 ...... =27 el mayor tiene esas edad
Planteamos la ecuación.
x + (x + 1) + (x + 2) = 75
x + x + 1 + x + 2 = 75
3x + 3 = 75
3x = 75 - 3
3x = 72
x = 72/3
x = 24
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Reemplazamos la variable x.
x + 1 = 24 + 1 = 25
x + 2 = 24 + 2 = 26
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Los números son : 24, 25 y 26.