Answer:

Step-by-step explanation:
We are given that

We have to find the value of given logarithms by using change-base formula
Base-change formula:

Where x=New base
Using the formula then, we get

Substitute the values 
Then,we get


7 is in the box i believe!!
The terms with the same variables is called like term
Hope it helps you !!!!!!! And if you want the step I will show you