Răspuns :
(x +323 +450 ) - 222 = 699
(x+773) = 699 + 222
x + 773 = 921
x = 921 - 773
x = 148
(x+773) = 699 + 222
x + 773 = 921
x = 921 - 773
x = 148
x +323 +450-222=695
X +773 =699 +222
X+773=921
X=921 -773
X=148