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PRIMERO RESUELVES LOS PARENTESIS, SOLO CAMBIAMOS EL SIGNO, ENTONCES TENEMOS:
4/3-6/9+8/5-8/5
SE ELIMINA 8/5 Y SIMPLIFICAMOS -6/9, ENTONCES NOS QUEDA
4/3-2/3
FINALMENTE, SOLO RESTAMOS LOS NUMERADORES:
(4-2)/3 = 2/3