18
It can be simplified to: 14d+19e
9d-19=6d+2 ... add 19 to both sides and subtract 6d from both sides... 9d-6d=2+19 3d=21 d=21/3 d=7
81% = 81/100
81 x 81 = 6561
How about: 9 times 9 = 81 or 81 times 1 = 81
-7d = 50 + 2d -9d = 50 d = -50/9 Or about -5.6
81 * 22 = 1,782
100x2-81
729/81 = 9
3 to the power of 4 = 81
54