$81y^2-18xy+x^2$
$-\left(4869\right)-\left(-20\right)$
$\lim_{x\to-1}\left(\frac{2x^2-2}{x-1}\right)$
$\frac{8x^2-22x-21}{4x+3}$
$-\sqrt{147}+\sqrt{192}-\sqrt{243}$
$\left(5+b^2\right)\left(5-b^2\right)$
$9x+7x-2z+3x-4y+6z$
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