$\frac{64x^6-125y^3}{4x^2-5y}$

$8x^2+64x+128\ge254$

$\left(3cd+4f\right)\left(4f-3cd\right)$

$-19\cdot\left(-29+x\right)\cdot\left(\frac{136}{19}+x\right)$

$45x^3y^4z^2-9x^2y^6z$

$\frac{3}{4}\sin\left(x\right)-\frac{1}{4}\sin\left(3x\right)=\sin^3\left(x\right)$

$-x^2+2x=-14$