$-9r^2+4s^2$
$\frac{-12x^3+9x^2+20x-15}{-4x+3}$
$\left(\left(-11\right)-\left(\left(-16\right)+\left(-12\right)\right)\right)+\left(\left(-17\right)-18\right)$
$7x-8y;\:x=5;\:y=2$
$\left(5x-2\right)\left(4x^2-5x-1\right)$
$\left(-2y\right)^{-3}\left(6y^{-2}z^8\right)^2$
$169-25$
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