$$\int\left(x^2+1\right)\left(x-3\right)dx$$

$$\frac{dy}{dx}+5y\left(x\right)=3$$

$$\int_{x^2}^x\left(e^{\frac{2y}{x}}\right)dy$$

$$\left(-63\right)\left(+35\right)+\left(+28\right)+\left(-72\right)$$

$$\left(16\right)\left(-14\right)\left(17\right)$$

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

$$a+a+3b+b$$