You can make lots of equations that have the solution 21. Here is one:
x = 21
If you think that is too trivial, add, subtract, multiply, or divide the same number to or from both sides.
Chat with our AI personalities
There is no variable, and the equation is not valid.
n + 13 = 21. n = 21 - 13
-16
If you mean: 7x+21 = 105 Then the solution is: x = 12
28
3, 7, 21. 3x7 is the only equation that equals 21, and so these are the only factors of 21.
There is no variable, and the equation is not valid.
n + 13 = 21. n = 21 - 13
-16
31
21
If you mean: 7x+21 = 105 Then the solution is: x = 12
28
It is a linear equation in two dimensional space. Such an equation defines a line in 2-d
32
If the equation is 7x - 3y = 21 then (3, 0) and (0, -7).
n/2 + 3 = 21