Okay, here we have this:
Considering the provided information, we are going to identify wich equation applies, so we obtain the following:

Where x represents the uknown number. Then finally we obtain that the correct equation is the third one.
Now, let's find the missing number solving the equation:

Finally we obtain that the number is equal to 19.
The Gestalt principle of proximity states that objects and shapes form groups if they are close to one another. The shapes, sizes, and objects do not matter in this case even when there are visible differences. The law shows that smaller elements come together in a composition.
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Explain yourself more and I’ll help