Răspuns :
238-173-7x7=2a
65-49=2a
16=2a
a=8
(5x10+10x5+9:3)-63=5a
(50+50+3)-63=5a
103-63=5a
40=5a
a =8
369-208-(10x10+5)=7a
161-105=7a
56=7a
a=8
65-49=2a
16=2a
a=8
(5x10+10x5+9:3)-63=5a
(50+50+3)-63=5a
103-63=5a
40=5a
a =8
369-208-(10x10+5)=7a
161-105=7a
56=7a
a=8