Algebra Level 2

$$\qquad \qquad Solve\quad for\quad x\\ \\ \frac { { x }^{ 4 }\quad -\quad 10{ x }^{ 2 }\quad +\quad 9 }{ { x }^{ 3 }\quad +\quad { 3x }^{ 2 }\quad -\quad x\quad -\quad 3 } \quad =\quad \frac { 5 }{ 7 }$$

Write your answers as an improper fraction $$\frac{a}{b}$$ then a + b

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