$z^{x+1xz-z^{x}}$
$\left(1-x^{-1}\right)^2\cdot\left(1-2x^{-1}\right)$
$\lim_{x\to0}\left(\tan\left(2x\right)\right)$
$\left(c^2+-c\right)^2$
$4x+2x+5x$
$\frac{2}{7}y+5=-9$
$81x^2+198x+121=0$
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