Answer :

(84÷7)+(9÷3) The parentheses are not necessary but I just put them.
I think that's what you meant. If you meant the other thing this would be the equation: (84÷7+9)÷3. Here the parentheses are nessasary

Answer: Our expression is [tex]\dfrac{84}{7}-\dfrac{9}{3}=15[/tex]

Step-by-step explanation:

Since we have given that

84 divided into sevenths means

[tex]\dfrac{84}{7}\\\\=12[/tex]

9 divided into thirds means

[tex]\dfrac{9}{3}\\\\=3[/tex]

Now, 84 divided into sevenths added to 9 divided into thirds means

[tex]12+3\\\\ =15[/tex]

Hence, our expression is [tex]\dfrac{84}{7}-\dfrac{9}{3}=15[/tex]