$-9\left(-6\right)+4$
$\left(6-7ab^2\right)^2$
$\frac{d}{dx}\:\frac{x^2}{16}\:+\:\frac{y^2}{25}\:=\:1$
$\infty-4$
$2\left(4q+2\right)+7q$
$\lim_{x\to0}x\cdot ln2x$
$\left(-5.683\right)\cdot7$
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