已知数列{an}满足a1=m,3（an+1）=2an+5n,其中m为实数,且m≠2／5,n为正整数.是否存在k、b,使得数列｛an+kn+b｝为等比数列?若存在求出k、b的值；否则说明理由分析下解题思路

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