Hey there!
Change the "addition" symbol to "subtraction"
We get:

Out of that equation we just made we get:

Now:

We have to divide by

on each of your sides
Like:

Cancel out:

because it gives you

Keep:

because it gives you the result of

which gives us the number on the other side of the less than sign
Finally, our answer:

(option

)
Good luck on your assignment and enjoy your day!
~
