$2x^2+3x^2-7x^2+8x^2-x^2$

$\left(b+ac\right)\left(c+ab\right)$

$\frac{a^3+b^3-ab\left(a+b\right)}{a^2-b^2}$

$\frac{250}{2.5}$

$\log\left(x\right)+5\log\left(y\right)-5\log\left(z\right)$

$\frac{\left(3-\frac{1x}{3}\right)}{\left(3+\frac{1}{2}\right)}$

$\frac{x^3-2x}{x^3+3x+2}$