84
78 It is 72.
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12 = 78
(4*18)+6 = 78
78 - without the aid of a calculator !
When x = 8 it is 78.
78+78-:(85)/(78)+7,879=1405
78 + 89 + 167 + 897 + 78 = 1309
55 + 82 + 92 + 78 + 100 + 96 + 78 = 581
In this equation, x=6.
78 + 78 = 156
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 12 + 34 + 56 + 78 + 91 + 7894561230 + 123456789 = 8018018326
78