$x\cdot y=4$
$7\left(4x+3\right)+10x-2$
$\left(\frac{5a^2b}{2a^3b}\:\right)^2$
$\frac{d}{dx}\left(e^{x^2-y^2}+\frac{x}{y}-2=0\right)$
$2a^2-13a+21$
$\lim_{x\to-1}\:x^2-5x-1$
$19+24-\left(-21\right)$
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