Răspuns :
a + ( a + 2 ) + ( a + 2 + 2 ) = a + 4038
a + a + 2 + a + 2 + 2 = a + 4038
3a + 6 = a + 4038
3a - a = 4038 - 6
2a = 4032
a = 4032 / 2 ⇒ a = 2016
a + ( a + 2 ) + ( a + 2 + 2 ) = a + 4038
3 × a + 2 × 3 = a + 4038
3 × a + 6 = a + 4038
3 × a - a = 4038 - 6
2 × a = 4032
a = 4032 : 2
a = 2016