$$-x<6$$

$$2ax-\:6ay+3xb-9by$$

$$\int\frac{x}{x^2-11x+28}dx$$

$$\left(2^2\cdot5m^2\right)\cdot n^2+9mn-20$$

$$1+7\left(1-3n\right)$$

$$\frac{\left(1+sin\left(2x\right)\right)}{sin\left(2x\right)}=1\:+\:\frac{1}{2}\sec\left(x\right)\csc\left(x\right)$$

$$f-\frac{19}{20}<-\frac{7}{12}$$