How do I solve [math]\lim_{x\rightarrow 0}\left | \frac{x+1}{x-1} \right |[/math] How do I solve this: [math]{\left(\frac{1}{4} \right)}^{x+1}+{\left(\frac{1}{6} \right)}^{x}-\sqrt{2}{\left(\frac{\sqrt{2}}{6} \right)}^{x}=1[/math]