can't complain. and nothing to complain about

(I) can't complain. and (I have) nothing to complain about.

Inf. a response to a greeting inquiry asking how one is or how things are going for one. Sue: How are things going? Mary: I can't complain. Mary: Hi, Fred! How are you doing? Fred: Nothing to complain about.
See also: and, complain, nothing
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