$\frac{1}{2}x=21$
$\frac{\left(9x^4-24x^3-3x^2+8x\right)}{\left(x-1\right)}$
$\left(a^{a^a}^{\sqrt{a^a}}\right)$
$\frac{2x^2-5x+2}{2x-1}$
$-\left(10\cdot100\cdot1000\right)$
$4x^2+6x-5=0$
$\left(\frac{x^6-5x^4+3x^2-2x}{x^2+x+2}\right)$
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