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Brian McLogan
Adding two rational expressions by finding common denominators
Learn how to add/subtract rational expressions with trinomials in the denominator. When adding or subtracting two or more rational expressions with common denominators, we add or subtract only the numerator while we keep the denominator...
Khan Academy
Khan Academy: Equivalent Fractions: Finding Common Denominators
This video shows how to rewrite two fractions as fractions with a least common multiple.