$\frac{1}{x}-\frac{1}{x\left(x+1\right)}$

$\frac{d}{dx}\left(x\left(x+6\right)^2\left(7x-1\right)^3\right)$

$\left(x+3\right)\left(x+2\right)+\left(x+4\right)\left(x+1\right)$

$5\log_x\left(2\right)-\log_x\left(16\right)=2-\log_x\left(2\right)$

$\left(4+4a\right)\left(4-4a\right)$

$\left(-21ab^2\right)+\left(14ab^2\right)$

$y^2-6y$