$2x-\left(-2x^2-5x\left(-x+1\right)-3x+3\right)$

$\left(3x^3+2x\right)\left(3x^3-2x\right)$

$\log_b\left(z\right)=-4$

$-x+y+\left(x+y\right)y'\:=0$

$-\:4\:+\:\left(\:-\:2\:+\:1\:\right)\:+\:5\:-\:\left[\:3\:-\:\left(\:1\:-\:2\:\right)\:+\:4\:\right]\:+\:1\:-\:2\:$

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

$\left(-3p^3qr^3\right)^3\cdot\left(-2p^2q\right)^3\cdot\left(-2pq^3r\right)$