$x+2x-1$
$log10x+log10\left(x+15\right)=2$
$\frac{16x^8-16y^8}{3x-3y}$
$81x^2-36xy+4y^2$
$25x^2-10x-1$
$\lim_{x\to2}\left(\frac{\ln\left(x-1\right)}{x-x^3+6}\right)$
$\left(3x^3-5y^4\right)\left(3x^2+4y^2\right)$
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