$\left(3x+4z+5y-3\right)\left(5y-3x-4z-3\right)$

$\left(x^2+1\right)\frac{dy}{dx}+2xy=1$

$\left(x-1\right)^2\left(2x+1\right)^2$

$\left(\frac{7}{9}a^{2}b^{2}c-9abc-4c\right)\left(\frac{2}{3}b^{2}c\right)$

$\left(\frac{2}{3}m^2+\frac{7}{2}mn-n^2\right)+\left(\frac{3}{2}mn+8m^2-\frac{1}{9}n^2\right)$

$\left(2m+w\right)^2$

$74\cdot83$