$\lim_{x\to-1}\left(\frac{\left(3x^4+7x^3+8x+12\right)}{x+1}\right)$
$xy^4=4$
$-9\left(x-2\right)=4\left(x-15\right)$
$\frac{r}{-7}\:=\:91$
$-7-\left(1-12\right)$
$2\cos^2x-5\cos x+2=0$
$-3\left(2x\:-4\right)$
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