Subtract number from left column

[PhilipeC]

I would like to subtract -10 from the left column, but only if the column is not empty and has a number. If left column G is 200 than H would be 190, If column G is empty than F would be empty.

 

[jtakw]

Duplicated here, probably by accident: https://www.mrexcel.com/forum/excel-questions/1054007-subtract-number-left-column.html