To solve this question, follow the steps below.
Step 01: Factor the denominator of each fraction using (b - 3).
First,

Second,

Third,

So, the expression is:

Step 02: Write all fractions together using b²(b-3) as a denominator.

Solve the multiplications and then the additions/subtractions in the numerator.

Step 03: Remove the denominator.
Since both sides are divided by the same number, you can remove it.

Step 04: Write all numbers on the same side of the equation.
To do it, subtract b² from both sides.

Step 05: Solve for b.
To do it, add 4 to both sides and then divide the sides by -2.

Answer: b = -2.