21 is the only solution of that equation.
m3 + m4 ≠90
The solution is k = 9.
Y=-6
56???
7 and (-3/2)
If you mean 28 = 7+y then the solution of the equation is y = 21
x = 3, y = 3
The solution (not sum) to the equation 21 = 3c + 6 is as follows:21 = 3c + 621 - 6 = 3c + 6 - 615 = 3c3c = 153c/3 = 21/3c = 7
2x - y = 15 2x + 3y = -21 As you observe both equations (having different slopes), you see that the system is consistent, and it has only one solution.
21 equals dots on a dice
28*21 equals 84