Simplify the expression $\frac{x^2+x-2}{x^2+5x+6}$

$\frac{x^3+x+5}{x+1}$

$factor\left(x^4+x^3-6x^2-4x+8\right)$

$factor\left(121+198x^6+81x^{12}\right)$

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

$\frac{12x^3+13x^2-59x+30}{4x-5}$

$\frac{x^3-2x^2+5x+2}{x^2-x}$

$\frac{6x^5-5x^3-35x-14x-14x^2+23x^4+20}{3x^3-5+x^2}$