$\left(\frac{3m^3}{5}-\frac{2m\frac{1}{3}n^5}{3}\right)^2$

$2x^2+x+4x+2$

$\left(-12\right)\:+15+\left(-20\right)+\left(-80\right)+14$

$-2b+3b-4a+5b$

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

$x^2zy+3xy^2z-2xy^2-3xy^2z+xyz^2-x^2yz$

$3x\left|4-\left(x-3\right)\right|+x\left(x+5\right)$