$$\left(7x^3+12x^2-8\right)-\left(-10x^3+2x^2+2x+1\right)$$

$$25a^6+20a^3n+4n^2$$

$$x^2\cdot\frac{d^2y}{dx^2}+x\cdot\frac{dy}{dx}+8\left(x^2-1\right)y=0$$

$$5y+3>-7y+13$$

$$( 6 x ^ { 2 } - m ^ { 2 } x ) ^ { 2 }$$

$$51-3.\left(1+1\right)$$