Add or subtract, as indicated. 4/x + 1 + 1/x² - x + 1 - 12/x³ + 1

Simplify each complex fraction. [1 + (1/x)] / (1-1/x)

Simplify each complex fraction. (2 - 2/y) / (2 + 2/y)

Simplify each complex fraction. [ 1/(x+1) - 1/x ] / (1/x)

Simplify each complex fraction. [ 2 + 2/(1+x) ] / [ 2 - 2/(1-x) ]

Simplify each complex fraction. [ 1/(a³+b³) ] / [ 1/(a² + 2ab + b²) ]

Simplify each complex fraction. [ 1/(x³-y³) ] / [ 1/(x² -y²) ]

Simplify each complex fraction. $\(\frac{m - \frac{1}{m^2 - 4}\)}{\(\frac{1}{m + 2}\)}$