Răspuns
[ ( a + 5 - 309 : 3 ) × 3 - 2007 ] × 5 - 35 : 5 - 72 : 8 + 9 = 2018
[ ( a + 5 - 103 ) × 3 - 2007 ] × 5 - 7 - 9 + 9 = 2018
[ ( a + 5 - 103 ) × 3 - 2007 ] × 5 = 2018 - 9 + 9 + 7 → aplic metoda mersului invers
[ ( a + 5 - 103 ) × 3 - 2007 ] × 5 = 2025
( a + 5 - 103 ) × 3 - 2007 = 2025 : 5
( a + 5 - 103 ) × 3 - 2007 = 405
( a + 5 - 103 ) × 3 = 405 + 2007
( a + 5 - 103 ) × 3 = 2 412
a + 5 - 103 = 2 412 : 3
a + 5 - 103 = 804
a + 5 = 804 + 103
a + 5 = 907
a = 907 - 5
a = 902 → numarul
