$\left(-52\right)-\left(-25\right)$
$44.08-20$
$\frac{x^3-7x-6}{x+2}$
$\frac{1}{1-\sec\left(x\right)}-\frac{1}{1+\sec\left(x\right)}$
$\sqrt{1-3x^2}y=x$
$8\:+\:2\left(x\:-\:6\right)\:+\:x$
$\left(a^2-16\right)\left(a+4\right)$
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