Math formula with if

Hello, i have columna columnb columnc and columnd. I want to set a rule for columnA which is like if a value in the columnA is a specific code like 712346 then divide columnd to columnc and write it to columnb instead of the existing columnb value. If columnA is a different value then the specified value above then keep the existing value o columnb. Can you guys help me to understand which node with which formula should i use?

Look at examples how to use If statement.

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