45 + x + 54 + x 2x + 99
54
45 + 9 = 54
45 + (20%) = 54
54
45 with the difference of 9 = 54
18 + 36 + 45 + 9 + 9 + 54 + 27 + 72 + 81 = 351
1/9 + 5/6 = 6/54 + 45/54 = 51/54 = 17/18 <-------------------------
45 + 54 88 + 11 27 + 72 3 + 96 and so on ...
No, nor is it a real number. The square root of minus 54 is equal to the square root of plus 45, times i.
45
Assuming that there is a "plus" after the second 58, the answer is - the associative property of addition.