$\left(\frac{4}{5}a+\frac{2}{3}b\right)\left(\frac{4}{5}a-\frac{2}{3}b\right)$
$y'+2xy=2x$
$\frac{d}{dx}\ln\left(3^{7x+x^2}\right)$
$\left(-0\right)+\left(-346\right)$
$a^7-a^5$
$a^2b^3c^6+a^2d^3$
$2.3x+2.8=-1.2x+9.8$
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