afla valoarea lu a:7×a=8×10-31
7 x a = 8 x 10 - 317 x a = 80 - 317 x a = 49a = 49/7a = 7
7a = 810 - 31. We perform the multiplication first.7a = 80 - 317a = 49a = 49/7a = 7lu a = 7