$3^0+9$
$4x^2-8x-4$
$\int\sqrt{x^2+4}7dx$
$x^6+x^4-x^2-x$
$-3x^2+2x-8\le\:0$
$x+2=2x+7$
$x-y+3z+x^2-y^2+2x-8z+3y^2+z^2$
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