All seem to give the same ans.
=SUMPRODUCT((a2:a22="x")*(TRIM(d2:d22)=""))
=SUMPRODUCT(--(a2:a22="x")*--(TRIM(d2:d22)=""))
=SUMPRODUCT(--(a2:a22="x"),--(TRIM(d2:d22)=""))
=SUMPRODUCT(--(a2:a22="x")*--(TRIM(d2:d22)=""))
is the same as saying
=SUMPRODUCT(-1*-1*(a2:a22="x")*-1*-1*(TRIM(d2:d22)=""))
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