A Cute Question From The Brazilian Math Olympiads

Algebra Level 1

Mary Ann entered the classroom and saw in the chalkboard some notes from the previous class, partially erased, as pictured. What is the coefficient of \(x\) which has been erased from the top line of the chalkboard?

Note: Raízes in Portuguese is the Roots of the equations.
There is a negative sign in front of the coefficient. Your answer should be positive.

Image source: OBMEP 2005 (Brazilian Math Olympiads of Public Schools).


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