$$8x+3=-21-4x$$

$$\frac{4x^3-x^2+5x-10}{x-2}$$

$$\frac{d}{dx}\left(x^2+x^2y^3-2y^2=0\right)$$

$$4+6+3-768-4+6$$

$$\lim_{x\to0}\left(\frac{\left\{\frac{1}{\left(2+x\right)}\right\}-\left(\frac{1}{2}\right)}{1}\right)$$

$$16x^{10}-28x^7+49^4$$

$$sin\left(x\right)-\frac{1}{sin\left(x\right)}$$