$4x^2<1$
$( 1 - 2 r ) ^ { 3 }$
$\left(a^2x^{-2}-a^3x^3+a^4x^{-4}\right)\left(ax^{-1}+a^2x^{-2}\right)$
$8x+3x-7x-x$
$\left|\left(-8+7\right)-\left(-2\right)\right|\cdot\left(-2\right)$
$\frac{9}{-3}$
$\left(5x^3-6c\right)\left(5x^3+6c\right)$
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