$3^{11}\cdot3^{-7}\cdot3^{-5}$
$\left(9d-8\right)\left(9d+8\right)=81d+64$
$x^2y+xy^2=y^2$
$9-11+13+2-4-5+9$
$8\left(\frac{3}{4}\right)^3-17\left(\frac{3}{4}\right)^2+12\left(\frac{3}{4}\right)+14$
$3a^4\cdot5a-18az$
$3r^3-42r^2+72r$
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