Does there exist an infinite solvable group with no normal abelian subgroups?

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This is impossible if $G$ is finite and solvable, because then $G$ has a (nontrivial) minimal normal subgroup $A$, which can be shown (using a trick) to be abelian.

I'm trying to mimic the same proof when $G$ is infinite and solvable, but there it's not obvious (to me at least) that $G$ must have a minimal normal subgroup. Any ideas?