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To solve this equation, we can first simplify it by multiplying both sides by (c-d):

(a-b)(c-d) = (a+b)(c+d)

Expanding both sides:

ac - ad - bc + bd = ac + ad + bc + bd

Next, we can simplify the equation by canceling out like terms:

• ad - bc = ad + bc

Now, we can solve for a and b by using the given information that ab = 20. We can substitute ab = 20 into the equation:

• 20 - bc = 20 + bc

Rearranging the equation:

2bc = -40

Dividing by 2:

bc = -20

Therefore, the solutions for a and b are a = -4 and b = 5.