Answer:
Step-by-step explanation:
Simplifying the fraction by multiplying d into the (n-1) term,
Simplifying the fraction by multiplying 2 throughout,
Multiply on both sides
Cancel the on the right hand side
Multiply s to the terms,
Move to the right hand side by subtracting on both sides
On the right hand side of the equation, take out
Divide Left hand side by ,