How can i echo string + command in terminal

Question

how can i 'echo' this command(NUMBER lines in my script):

Number of lines is 23.

Code:

#!/bin/bash
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echo Number of line is cat $0 | wc -l
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Answer 1

This should do the trick.

#!/bin/bash

echo "This script is `wc -l $0 | cut -d " " -f 1` lines long."