$7+ab-b+b-2ab$

$\left(-5a^3b^2+3a^2b\right)\left(-3a^2b-5a^3b^2\right)$

$5x^{18}+y^2=1$

$\int\frac{10}{\left(x\right)\left(x+4\right)\left(x+5\right)^2}dx$

$\frac{x^2-5x+2}{x+1}$

$\frac{d}{dx}\left(\left(4x+1\right)^4\right)\left(3x+1\right)^{-2}$

$\int\frac{1}{\left(\left(x+6\right)^2+49\right)^{\frac{1}{2}}}dx$