Răspuns :
(20+50)+800:a-70=8
70+800:a-70=8
70+800:a=70+8
70+800:a=78
800:a=78-70
800:a=8
a=800:8
a=100
70+800:a-70=8
70+800:a=70+8
70+800:a=78
800:a=78-70
800:a=8
a=800:8
a=100
(20 + 25 * 2) + 800 : a - 7 * 10 = 8
(20 + 50) + 800 : a - 70 = 8
70 + 800 : a = 8 + 70
800 : a = 78 - 70
8a = 800
a = 800 : 8
a = 100
(20 + 50) + 800 : a - 70 = 8
70 + 800 : a = 8 + 70
800 : a = 78 - 70
8a = 800
a = 800 : 8
a = 100