Adding two columns where only one of the cells in either column A or B contains data

Hello guys,
Excel vraagstuk.PNG
So, I have column A and column B. Both columns contain numbers. For each row under these separate columns, it's either
the cell under column A that contains a number or a cell under column B, meaning that they don't contain data at the same time. For some
rows, both cells are empty, this is the only exception. Now I have to make one column out of those two columns without losing data, how do I do this?

Help is so appreciated man :D

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Pete