为了迎接校运会的到来，某校准备了若干盆花。若是将其摆成最外层每边a盆花的实 心正三角形，多8盆花;若是将其摆成最外层每边(n+1)盆花的实心正三角形，少9盆花。现决 定将其摆成实心方阵,最后所有花恰好全部用完，问:最多摆几层？

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