$5x^2+6x-9x^2+8x-x+x^2$
$6,75+19,043$
$3r-6r$
$\sqrt{x}.\sqrt{y}.\sqrt{x}$
$-22st+7st$
$\frac{5x^2y^{-3}}{15x^5}$
$\left(2x^2y^3\right)\left(3xz^2\right)\left(5y\right)$
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