$\lim_{x\to\infty}\:\:x^4e-x^3$
$6\left(-7\right)+\left(-9\right)\cdot12-4\left(-8\right)$
$-\frac{dz}{dx}=\frac{z-3}{z-1}-1$
$\left(234\right)\left(340\right)$
$\left(2xy+5yz\right)^2$
$x+4<-1$
$\lim_{x\to8}\left(4x-7\right)$
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