$\frac{2}{5}a\:-\:a$
$\left(-6z\right)\left(-4z^2\right)$
$\left(4a+5b\right)^2$
$\sin\left(\frac{5}{13}+\frac{1}{2}\right)$
$\frac{d}{dx}\left(x\sqrt{x^2+6}\right)$
$6+2\cdot3-[\left(-7\right)\cdot\left(-4\right)]:2+3-1$
$\frac{-2}{5}=\frac{x}{-15}$
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