How to make a calculator?

I am making a calculator in Virtual Basic for almost a week. I am encountering a problem when using the equals sign. When I type problems like 4 + 6 = 10 it answers correctly. When I press the equal again immediately after the calculator answers 10. It should enter as 10 + 6 = 16 but it does not work like that. How do I create a calculator that when users press again and again they will have a loop of + 6? Please help me. This is the code I used for my equal sign button.

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