$5z+z$
$\lim_{x\to0}\left(\frac{\sin\left(x\right)}{\tan\left(x\right)+1}\right)$
$40+30-10$
$2-4u+8u$
$\frac{-x^{4}y^{5}}{x^{2}y}$
$\left(a+2b-3c\right)\left(a+2b-3c\right)$
$\frac{\left(2x^2\right)^3}{4x^4}$
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