$\lim_{x\to4.999}\left(x+9\right)$
$x^2\left(y^2-2\right)=2$
$\int6x^{-\frac{2}{3}}dx$
$18p+8q+2p-7q$
$a^2x+b^2x$
$9f^2+c^2-6fc$
$\frac{x^4}{x^3}$
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