$$\left(a+1\right)+\left(3a+3\right)$$

$$6xy+x+5xz$$

$$\int_0^{20}\left(\frac{3}{\sqrt{400-x^2}}\right)dx$$

$$6x+11>18-x$$

$$10a^2+7a-12$$

$$\left(x+\frac{q}{s}\right)^2$$

$$\int_0^{\infty}\left(\frac{10x}{\left(x^2+1\right)}\right)dx$$