$\frac{d^2}{dx^2}8$
$3xyz^2-2v^2-2z^2+3xyv^2$
$x^2+\frac{b}{a}x$
$\left(-5a-2b^2\right)^3$
$9x^2+5xy$
$7-3x,x=4$
$3n-6m^2+2n$
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