$\left(0.5x^3+0.6y^2\right)^2$
$\frac{d^2}{dx^2}\left(x^4-6x\right)$
$9abc-12a^2c+18ab^2$
$\left(\mathbf{4}x+\mathbf{7}y\right)\left(\mathbf{4}x-\mathbf{7}y\right)$
$9x^2-9x+2=0$
$\int\frac{x}{\sqrt{2x+7}}dx$
$\left(\frac{9}{4}x+3\right)\left(\frac{9}{4}x-6\right)$
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