Error: Error in balancing the equation: There is an infinite amount of solutions.

Error: Error in balancing the equation: There is an infinite amount of solutions.

1. | Cu + _{2}SFeS + _{2}HNO → Fe(NO_{3}_{3})_{2} + Cu(NO_{3})_{2} + NO + H_{2}SO_{4} + H_{2}O |

2. | Cu + _{2}SFeS + _{2}HNO → CuSO_{3}_{4} + NO + Fe_{2}(SO_{4})_{3} + H_{2}O |

1. | Cu_{2}S + FeS_{2} + HNO_{3} → Fe(NO + _{3})_{2}Cu(NO + _{3})_{2}NO + H + _{2}SO_{4}H_{2}O |

2. | CuFeS_{2} + HNO_{3} → Fe(NO + _{3})_{2}Cu(NO + _{3})_{2}NO + H + _{2}SO_{4}H_{2}O |