Complete the equation so that it has no solution

5x + 12 = ___x + 9

The equation will have no solution if we make the coefficients of x on both sides of the equation equal but the constants are not equal.

To achieve this, we can set the equation as follows:

5x + 12 = -5x + 9

Now, the equation has no solution because whatever value we substitute for x, the equation will not be true.