$$-4.8-\left(27+35\right)-60$$

$$4\:x\:-\:y\:+\:5\:x\:+\:2\:x\:-\:y\:\:$$

$$\frac{d^3}{dx^3}\left(x^2e^{3x}\right)$$

$$\frac{x^3-1}{x^2+1}$$

$$\lim_{x\to\infty}\left(1+e^{2x}\right)^{\frac{1}{4x}}$$

$$\left|1+\left(-83\right)\right|-37$$

$$3x-4y=6$$