$\frac{3x^4-x^2+x}{x^3-2x}$

$4x^2-x-6=0$

$\left|\left(x+6^5\right)\right|^4$

$\left(+5\right).\left[\left(-3\right)\left(-7\right)\right]$

$y^{\frac{1}{4}}=xk$

$\frac{\sec\left(x\right)^2-1}{\sin\left(x\right)}=\tan\left(x\right)\sec\left(x\right)$

$-7\left(9+2x\right)$