Given:
Mary baked 34 muffins on a Sunday.
She gave 17 of them to her neighbor.
consider, the number of muffins left will be x.
the equation is represented as,
[tex]34-17=x[/tex]take the subtraction,
[tex]\begin{gathered} 34-17=x \\ \Rightarrow x=17 \end{gathered}[/tex]Answer: the number of muffins she had left was 17 .