Combining rational expression with unlike denominators

The video tutorial explains how to find the least common multiple (LCM) of two denominators, X + 1 and X - 1, by multiplying them together. It then demonstrates how to multiply the numerators and denominators to achieve the LCM, apply the distributive property, and combine terms. The tutorial further explores simplifying the expression by factoring and finding the final solution, X + 3 / X + 1, with a constraint that X cannot equal -1.

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