$$x+9\ge10$$

$$4r^2-12r+9$$

$$51\:-\:-50$$

$$\left(5a-2b+3c\right)+\left(7a+9b-2c\right)$$

$$\int\sqrt{x^2+x+1}dx$$

$$6\left(x-2\right)-4\left(x-1\right)=4$$

$$y\left(1+\sin\left(x\right)\right)dy=\left(y-1\right)^2dx$$