$x+\left(-21\right)=\:-18$
$6m+14-3\left(3m+7\right)$
$\left(\sqrt{7}+\sqrt{x}\right)\left(\sqrt{7}+\sqrt{x}\right)$
$\sin\left(2\theta\:\right)=\cos\left(\theta\:\right)$
$-13\cdot\left(-9\right)$
$\frac{d}{dx}x^3-3x\:+y^3=1$
$\frac{\left(\infty\right)^3}{3}\cdot\left(\frac{-\left(-\infty\right)^2}{2}\right)+\frac{0}{2}-\left(\infty\right)^2$
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