$-9-4\left(x-7\right)$

$\frac{5}{6}\cdot\left(3-x\right)-\frac{1}{2}\cdot\left(x-4\right)\ge\frac{1}{3}\cdot\left(2x-3\right)-x$

$\left(12xy+8xy^2\right)dx+\left(6x^2+8x^2y\right)dy=0$

$\int\left(\frac{sin\left(9ln12x\right)}{7x}\right)dx$

$\frac{x^3}{4x^4}$

$\left(x+24.5\right)\left(x-24.5\right)$

$\tan^2x+2\sec^2x$