Algebra - Ch. 0: Basic Concepts (20 of 26) Add/Subtract Fractions: Method 4: Example 2

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In this video I will find the lowest common denominator, LCD, to solve type 4 of adding/subtracting fractions: 3/8-1/10+7/20=? Example 2

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Professor, why do we count 5 only once (minute 1:55)?

afihaileywibowo