Find All Values of X Satisfying the Given Conditions $y _ { 1 } = \frac { 1 } { x + 4 } , y _ { 2 } = \frac { 1 } { x - 4 } , y _ { 3 } = \frac { 1 } { x ^ { 2 } - 16 }$

Multiple Choice

Find all values of x satisfying the given conditions.
- $y _ { 1 } = \frac { 1 } { x + 4 } , y _ { 2 } = \frac { 1 } { x - 4 } , y _ { 3 } = \frac { 1 } { x ^ { 2 } - 16 }$ , and the difference between 4 times $y _ { 1 }$ and 2 times $y _ { 2 }$ is the product of 6 and $y 3$ .

A) $\{ 30 \}$
B) $\{ 15 \}$
C) $\{ - 15 \}$
D) $\{ 3 \sqrt { 2 } \}$