Given the following equation:

You can follow the steps shown below in order to solve for the variable "b":
1. You can add the like terms on the right side of the equation:

2. You can observe that the left side of the equation is equal to the right side, so if you solve for "b" its coefficient will be zero:

This is a statement that is always true. When this happens, the solution of the equation is all the Real numbers.
Therefore, the answer is: The equation has an infinite number of solutions.