qqp question1: How do I solve? 4^ {-\frac {1} {x}} +6^ {\frac {-1} {x}} =9^ {\frac {-1} {x}}? question2: How do I solve this [math]\frac{x^{2}}{16}+\frac{9}{x^{2}}=2(\frac{x}{4}-\frac{3}{x})+\frac{1}{2}[/math] for x?