$\left(+\infty\right)^{-3}$
$\frac{4x-3}{x^4+2x^3+3x^2}$
$-3f-7f+2-8$
$x^2<60$
$x^2+8x-9=0$
$\frac{1}{6b^2}+\frac{1}{6b}=\frac{1}{b^2}$
$-3\left(2x^2y\right)^2$
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