$\:\left(+34\right)\:-\:\left(\:-25\:\right)$

$y^2-8xy+16x^2$

$\left(x-y\right)=-1$

$\int\frac{4x^3-4x^2+10x-5}{\left(4x^2+9\right)^2}dx$

$\lim\:_{a\to\:0}\left(\frac{2-\sqrt[6]{3a+64}}{5a}\right)$

$\frac{-y-2y+3xy^2}{y^2+xy^3}$

$\left(\frac{4}{5}x+\frac{3}{4}y+\frac{4}{3}z\right)+\left(\frac{7}{5}x-\frac{7}{4}y+\frac{5}{3}y\right)$