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3 2 - x
---------- = -----------
2 x
Por la propiedad fundamental de las proporciones
4/3 * x = 2(2 - x)
4/3x = 4 - 2x
4/3x + 2x = 4
10/3x = 4
x = 4 : 10/3
x = 12/10 = 6/5 o 1,2
verificamos
4/3 * 6/5 = (2 - 6/5) .2
8/5 = 8/5
saludos