$\lim_{x\to1}\left(\frac{4x^2lnx}{x^2-1}\right)$
$6^2+8b+15$
$3ax-bx-3ay+by$
$\left(x+3\right)^2+\left(x-3\right)^2-6<0$
$-3x^3y^2-5x^3y+5x^3y^2$
$4^3\cdot6^{-2}$
$\int\frac{1-2x}{\left(x-5\right)\left(x+1\right)}dx$
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