$$\left(-9\right)-\left(+12\right)-\left(-2\right)$$

$$\int t\sqrt{5t^2+4}dt$$

$$\int\left(\frac{6}{\left(\left(x^2\right)-1\right)}\right)dx$$

$$7^8+7^2$$

$$\left(x\right)\left(x-15\right)$$

$$-45+-14-89-156+342$$

$$m2+14m+33$$