$7x+7<3x+23$
$\frac{4x^2+36}{4x}x\frac{1}{5x}$
$a^2-b^2=0$
$\left(m+4\right)\left(m-4\right)\left(m+7\right)\left(m-3\right)$
$\frac{d}{dx}\frac{1}{e^{3x}}$
$2\sqrt{\left(x\right)}\cdot\frac{1}{2}x^{-\frac{1}{2}}$
$9y^2+21y+3$
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