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$\left(x^2-x+1\right)^2$
$-8^2$
$2\left[x+7\right]+3\left[x+1\right]$
$\left(4y^2-16y\right)+\left(z^2-4z\right)-\left(x+20\right)$
$3x^2-3=45$
$\cos^2=0.1$
$\left(2x^3-7x^2-13x\right):\left(2x+3\right)$
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