Learn how to solve a proportion by applying the cross product ex 15, 15/(x+7) = 45/(x+21)

The video tutorial explains the process of using cross multiplication to solve equations with different denominators. It begins by identifying when cross multiplication is appropriate, then sets up the equation using the cross product. The tutorial emphasizes the importance of parentheses and the distributive property. It proceeds to solve the equation step by step, using a calculator for multiplication, and concludes by simplifying the equation to find the solution.

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