$-2\left(4-a\right)$
$9x^2+12x+12$
$y^2\left(y^2-y+4\right)$
$2m^2-7m+3$
$\frac{d}{dx}x^2-2xy+y^2=1$
$2ab+b^2$
$\left(+95\right)-\left(-2\right)-\left(+5\right)$
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