Răspuns :
(737+6×a)-16×13=535
(737+6×a)-208=535
(737+6×a)=743
743×a=743
a=743:743
a= 1
(737+6a)-208=535
737+6a= 535+208
737+6a= 743
6a= 743-737
6a=6
a=6:6
a=1
737+6a= 535+208
737+6a= 743
6a= 743-737
6a=6
a=6:6
a=1