$\left(\left(6x^3y^9\right)\cdot\left(7xy^2\right)\right)-\left(\left(9x^3y^2\right)\cdot\left(3xy^9\right)\right)+\left(8xy^2\right)^2$

$\frac{6x^4+4x^3-2x-4}{x+9}$

$\int\frac{2x-3}{x^2-2x+3}dx$

$20\log\left(60.55\right)$

$7x^3+2x-5x^2+6+x+9+3x^3+12x^2$

$4x^2-8x+4=0$

$\left(9ab^4-c^7\right)\left(9ab-c^7\right)$