x ∈ N
11 I 11 2x + 45 = 11 ; 2x = 11 - 45 ; 2x = - 34 ; x = - 17 fals
11 I22 2x + 45 =22 2x = - 23 fals
11 I 33 2x + 45 =33 2x = - 12 fals
11 I 44 2x + 45 = 44 2x = - 1 fals
11 I 55 2x + 45 = 55 2x = 10 ; x = 5
11 I 66 2x + 45 = 66 2x = 21 x = 21 / 2 fals
11 I 77 2x + 45 = 77 2x = 32 x = 16
11 I 88 fals ,
11 I 99 2x + 45 = 99 2x = 54 x = 27
11 I 121 2x + 45 = 121 2x = 76 x= 38