$9^2.3^{35}.4+15\:\left(\frac{3^{34}}{3^6}\right)$
$\frac{-xy^2z}{-xy^2z}$
$\left(+1\right)\cdot\left(+24\right)$
$\left(b-c\right)\left(b+d\right)$
$\lim_{x\to1}\left(\frac{x^{15}-1}{x^3-1}\right)$
$x^3+2x$
$7-x=19$
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