Answer:
b=8
Explanation:
Given the equation

Step 1: Take the Lowest common multiple of the left hand side.
The LCM of 5 and 5=5.
Step 2: Combine using the LCM

Step 3: Cross Multiply
-b-2= -2 X 5
-b-2 =-10
Step 4: Add 2 to both sides
-b-2+2 =-10+2
-b=-8
Step 5: To solve for b, Divide both sides by -1
b=8
NOTE: In your steps given
-2 X 5 = -10