For getting row use:
=LARGE(IF($D$12=$D$7:$H$9,ROW($D$7:$D$9)-ROW($D$7)+1),1)
For getting column use:
=LARGE(IF($D$12=$D$7:$H$9,COLUMN($D$7:$H$7)-COLUMN($D$7)+1),1)
Both are array formula so must enter with Ctrl+Shift+Enter.
(I assume there will not be any duplicate value in your table)
A non array solution for the column number =SUMPRODUCT(COLUMN(D7:H9)*(D7:H9="b4"))-COLUMN(D7:H9)+1
The same for the row just replace " column" with " row"