I assume you want an equation with a solution of 212. Just write:
x = 212
If you want something more fancy, do something to both sides of the equation - this is basically the opposite of what you do to solve an equation. For example, you can multiply both sides of the equation by some number (the same on both sides, of course), add the same number to both sides, square both sides (note that this will most likely add additional solutions, that are not solutions to the original equation), etc. If you already know a bit about more advanced math, you can take logs or antilogs on both sides, take sines or inverse sines on both sides, etc. (this, too, may introduce additional solutions).
How about if 2x = 424 then the solution is x = 212
Pb-212
2x=4,522,212 Done
There are several possible answers. One pair is 1 and 212.
There is no possible value of x that will satisfy the given equation. There is no possible value of x that will satisfy the given equation. There is no possible value of x that will satisfy the given equation. There is no possible value of x that will satisfy the given equation.
Yes, zero could be a possible solution to the equation.
Po-216- -----------------> Pb-212
It is an equation and the value of x works out as 88
y = x - 11 is one possible equation.
5678 + 8765 = 14443 would yield the largest possible sum.
YES
It is not an equation and no solution is possible.