Unknowns are Unknowns! (Part 2)

Algebra Level 3

$\large \begin{cases} 2x^2 + 2y^2 = 5xy \\ \dfrac{x-y}{x+y} = \dfrac{a}{b} \end{cases}$

Real numbers $x$ , $y$ , $a$ , and $b$ , where $a$ and $b$ are positive coprime integers, satisfy the system of equations above. Find $a \times b - a + b \div a$ .

Unknowns are Unknowns! (Part 2)

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