$\frac{2x^2-x}{x^2-x+2}$
$\left(x+\:y\right)^7$
$\frac{10^5}{10^2}$
$4a=3b-121$
$\left(7^0x^3y^{-1}\right)^2$
$\left(2500+2400\right)$
$3x^2\left(x^4+2x^{-3}\right)s$
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