# Do I need to determine their values first?

Algebra Level 3

$\large 2a^2 + 3b^2 = 7ab, \ \ \ \ \ 0 < a

If $a,b$ satisfy the conditions given above, and that $\frac{a-3b}{a+3b}$ can be expressed as $-\frac qs$ for coprime positive integers $q,s$, find $q+s$.

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