$\frac{x^2+7x-78}{x^2-36}$
$\lim_{x\to999}\left(11xe^{\frac{1}{x}}-11x\right)$
$-7x-2-9y+10x$
$-4x^2+4x=0$
$12b-15>21$
$vx^{-v-1}$
$\lim_{x\to\infty}\left(\frac{x^2}{-2x^4+3x^2-6}\right)$
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