Răspuns :
a : 4 +168 - 105 = 73
a : 4 +168 = 73 +105
a :4 + 168 = 178
a : 4 = 178 - 168
a :4 = 10
a = 10 x 4
a = 40
a : 4 +168 = 73 +105
a :4 + 168 = 178
a : 4 = 178 - 168
a :4 = 10
a = 10 x 4
a = 40
a - numarul
(a : 4) + 168 -105 = 73
a : 4 + 63 = 73
a : 4 = 73 - 63
a : 4 = 10
a = 10 x 4 = 40
numarul e 40
(a : 4) + 168 -105 = 73
a : 4 + 63 = 73
a : 4 = 73 - 63
a : 4 = 10
a = 10 x 4 = 40
numarul e 40