[tex]\huge\boxed{\tt{Hello~there!}}[/tex]
Equivalent means equal.
So, we need to find fractions that are equal to
[tex]\displaystyle\frac{-3}{7}[/tex]
There's an infinite amount of fractions that are equivalent to the given fraction. Here are some of them:
[tex]\bf{\displaystyle\frac{-6}{14}[/tex], [tex]\bold{\displaystyle\frac{-9}{21} }\\[/tex]...
Hope it helps you.
Feel free to ask if you have any doubts.
[tex]\bf{-MistySparkles^**^*[/tex]