$\frac{a+3}{a}+\frac{3a-3}{3a}$
$26\:-\:\left(-9\right)$
$\lim_{x\to0}\left(1-x\right)^{0.5}$
$25v^2+40vw+16w^2$
$x+14x$
$\left(x^4-9\right)\left(x^4+9x^2+81\right)$
$\left(\frac{1}{2}xy-z^4\right)\left(z^4+\frac{1}{2}xy\right)$
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