$\ln\left(x+3\right)-\ln\left(3\right)+\ln\left(x-1\right)-\ln\left(x+1\right)=0$

$a^2b^2+a^3b^3-ab$

$\left(ab-8\right)\left(ab+5\right)$

$1-4g+g-7$

$\left(a^3b^2\right)^2$

$\left(\frac{9}{20}d^5\right)\left(2d^{-2}\right)\left(\frac{4}{3}d^9\right)$

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