$\left(12a+8b-4c\right)+\left(5a-7b+c\right)+\left(-10a-4b\right)$

$\frac{y}{12}+2=-16$

$\frac{8x^2-2x}{2x}$

$\left(\frac{\left(2x^{-4}y^4\cdot2x^4\cdot x^{-2}y^4\right)}{2y^3}\right)^3$

$-8v-1=4v-1$

$\left(\cos\left(x\right)\right)\left(\sec\left(x\right)-\cos\left(x\right)\right)=\sin^2\left(x\right)$

$\left(9x-1\right)\left(9x+5\right)$