WeBWorK Standalone Renderer

Find the limit. Use l’Hospital’s Rule if appropriate. Enter Infinity if the limit $+\infty$ , -Infinity if it is $-\infty$ , or DNE if the limit does not exist.

$\displaystyle{\lim_{x\to \infty} \left(\frac {2x-3}{2x+6}\right)^{2x+2} =\ }$