$\left(x^4+5x^3+4x^2-7x-3=0\right)\left(x=-3\right)$
$\frac{x^5}{x^3}\frac{y^3}{y^2}\frac{z^2}{z^2}$
$\lim_{x\to\infty}\left(\frac{2x^2}{x+4}\right)$
$\left(-6a^2+7\right)\left(-6a^2+2\right)$
$4 x ^ { 10 } - 36 \times 5 + 81$
$\frac{2^2-x^2}{2-x}$
$\left(7x+2x+2z\right)^2$
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