$-\frac{500}{50}$
$\left(y+3z\right)\left(x-3z\right)$
$5\sin^2\left(x\right)-8\cos2x=0$
$\frac{3x-2}{2x^2+4x-6}$
$-6x^2-101x-315=-3x^2-65x-207$
$\frac{6x^4-9x-x^2-2}{x^2+1}$
$\lim_{x\to\infty}\left(\frac{20x}{20x+9}\right)^{8x}$
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