An equality
Source: Turkey National Mathematical Olympiad 2018
December 2, 2018
inequalitiesalgebrasystem of equations
Problem Statement
Find all pairs of real numbers that satisfy,
\begin{align*}
x^2+y^2+x+y &= xy(x+y)-\frac{10}{27}\\
|xy| & \leq \frac{25}{9}.
\end{align*}