$8^2+8$
$x-7=2x+1$
$\frac{-x^2}{x+1^2}$
$y^4+2y^2+1=\left(y^2+1\right)^2$
$-1.9\cdot x=-4.75$
$\frac{d}{dx}\left(\frac{x^{\frac{3}{4}}\cdot sqrt\left(x^2+1\right)}{\left(3x+2\right)^5}\right)$
$x^{10}-81$
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