$\frac{5-z}{2}=2z$

$\left(\frac{\left(4\right)}{\left(5a^2\right)}\right)+\left(\frac{\left(2\right)}{\left(6a\right)}\right)$

$x^2+13x-32=0$

$-\left(23-45\right)-\left(75-34\right)$

$9+3x^2-y^2-\left(6+6x^2-3y^2\right)-4$

$\int\cos x\ln^2\left(\sin\left(x\right)\right)dx$

$6n^2-7n^2$