exam Maths Puzzle Numerical Ability

please help me to fin the answer of this question : ab+a-b=2001, find the value of a and b. if a and b are a real number.

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ISBN (very important): 0-07-822880-8
Textbook title (optional): Glencoe Geometry Integration,Applications,Connections
Edition number: PG.226
Chapter number: Chapt.4 Identifying Write the quadratic equation with a lead coefficient of 1 whose roots are (-1/2) and (4/5).