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para comenzar vamos a restar a todos 10
34 - 10 ≤ 6/5x + 10 -10 < 40 -10
24 ≤ 6/5x < 30
ahora vamos a multiplicar para 5 y dividir para 6 a todos:
24 * (5/6) ≤ 6/5x * (5/6) < 30 * (5/6)
20 ≤ x < 25
entonces el intervalo de X debe ser mayor o igual a 20, pero menor a 25!
SALUDOS!