$$\int5x-7\:dx$$

$$2x+7\cdot2x$$

$$\lim_{x\to0}\left(\frac{x+sen2x}{x}\right)$$

$$\left(x+7\right)\left(2x+1\right)$$

$$\left(-2\right)\left(+2\right)\left(-3\right)\left(+4\right)\left(-5\right)$$

$$4x+y-2x+y$$

$$3x^5+13x^4-8x^3+8x^2-11x-5$$