$8x=1000$
$\cos\left(x+20\right)=0.33$
$x^2-2x=1$
$x^5y^3+2\:x^5y^3+4x^5y^3$
$\frac{d}{dx}e^{-0.2x-5}$
$3x^4+5x^2+x$
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