$\left(b-9\right)\left(b+4\right)$
$\left(-2\right)^2-\left(-2\right)\cdot3+2\cdot\left(3\right)^2$
$-3d-5d$
$-x-19x-18x$
$\lim_{x\to-1}\left(\frac{8x^2+16x}{5x+5}\right)$
$9-8a^2>\:0$
$8+4-6-9+19-12+15-19$
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