You would subtract how many times Dion tagged bill with how many times bill tagged Dion, so 12 - 7 = 5
This phrase can be written as 20 + f.
So, 20 + f is the answer.
Using translation concepts, the equation for function g(x) given in the graph is:

<h3>What is a translation?</h3>
A translation is represented by a change in the function graph, according to operations such as multiplication or sum/subtraction either in it’s definition or in it’s domain. Examples are shift left/right or bottom/up, vertical or horizontal stretching or compression, and reflections over the x-axis or the y-axis.
The parent function for this problem is given as follows:

From the graph, function g(x) was shifted 2 units left, hence x -> x + 2 and the definition is:

More can be learned about translation concepts at brainly.com/question/28098112
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-3 1/2 = 1/2x + 1/2x + x
- 7/2 = 2x
(-7/2) / 2 = x
-7/2 * 1/2 = x
- 7/4 (or - 1 3/4) = x