Răspuns :
a × 9 + 4 : 2 × 0 = 45
a × 9 + 2 × 0 = 45
a × 9 + 0 = 45
a × 9 = 45 - 0
a × 9 = 45
a = 45 : 9
a = 5
a × 9 + 2 × 0 = 45
a × 9 + 0 = 45
a × 9 = 45 - 0
a × 9 = 45
a = 45 : 9
a = 5