Answer:
[tex]\large\boxed{\frac{12a+24}{6}=2a+4}[/tex]
Explanation:
Those expresisions are equivalent because for any value that you use to substitute the variable [tex]a[/tex] both expression will return the same value.
Here is an example of substitution proving that the expresssions are equivalent:
[tex]a=0[/tex]
[tex]\frac{12a+24}{6}=\frac{12(0)+24}{6}=\frac{24}{6}=4[/tex]
[tex]2a+4=2(0)+4=4[/tex]