The equation x = 3 has a solution of x = 3. This is because when you substitute x = 3 into the equation x = 3, it satisfies the equation and makes it true. Therefore, x = 3 is the equation with the solution x = 3.
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The equation that has the solution x = -3, is, precisely:x = -3
If you want anything more fancy, you can add some number (the same number to both sides), multiply by some number (the same number to both sides), etc.
There can be no solution to an algebra equation because of limitations of the domain. For example,x+3 = 2 has no solution if the domain for x is the set of positive integers,x*3 = 2 has no solution if the domain for x is the set of whole numbers,x^3 = 2 has no solution if the domain for x is the set of rational numbers,x^2 = -2 has no solution if the domain for x is the set of real numbers.Alternatively, the equation has no solution if it can be reduced to a false statement. For example,x + 2 = x + 3 can be simplified to 2 = 3 which is false and so there is no solution.
An equation that has no solution is called an equation that has no solution.
Without an equality sign and not knowing the plus or minus values of the given terms it can't be considered to be an equation and so therefore it has no solution.
The roots of the equation are -4 and 3. Simplest solution is (x +4 )(x - 3) which multiplies out as x^2 + x - 12 = 0
If you mean: y+x = 3 then the solutions are (0, 3) and (3, 0)