$\lim_{x\to0}\left(\frac{7e^{4+x}-7e^4}{x}\right)$
$\frac{x^3-3x^2-x^1+6}{2x^1+3}$
$1xa+2^2-5$
$\int-5xe^{-x}dx$
$\left(-\frac{1}{2}x^3y^2-3-x\right)\left(-\frac{1}{2}x+x^2\right)$
$h\left(z\right)=\left(6-z^2\right)\left(z^3-z+2\right)$
$2x^4+4x^3+2x^2$
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