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x - 1/3 + x + 1/2 + x + 3/5 = 8
3x - 10/30 + 15/30 + 18/30 = 8
3x - 23/30 = 8
3x = 240/30 + 23/30
3x = 263/30
x = 263/90, respuesta
Espero te sirva