$\left(2x^2-3\right)\left(2x^2+7\right)$
$100a^{4}-100a^{2}b^{3}+25b$
$-x^2+6x-10=0$
$xy+3y;\:x=2;\:y=3$
$\left(\frac{2}{3}x^5-\frac{1}{9}x^3\right)^2$
$3a+2\le8$
$\frac{4x^5-30x^3-50x}{x+3}$
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