$5x^3-x+4$
$\int\frac{x}{\left(1+2x\right)\left(1+x^2\right)}dx$
$6y+8z$
$\left(4x+18\right)\left(ax-12\right)$
$504^2$
$\frac{du}{dy}=u-y$
$x+7>9$
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