$$\frac{2}{5}u^3-\frac{1}{2}v\:.\:\frac{2}{5}u^3+\frac{1}{2}v$$

$$\frac{p}{5}+2=-5$$

$$\frac{2x-9}{x-7}+\frac{x}{2}=\frac{5}{x-7}$$

$$-1,34m^3n+0,54m^7n^2-0,34m^3n-6,3m^7n^2$$

$$10y^2+11+3$$

$$4x^2-15x+9$$