In this video we will be learning how to solve complex proportions (variables on both sides) using cross-multiplication.

For Example:

First we cross-multiply

Then we distribute the 20 to the x and 1

Subtract 20x from both sides to isolate* x*

Divide by 10 on both sides

## Video-Lesson Transcript

Let’s go over complex proportions.

For example:

What makes this complex is that we have one variable on both sides of the equation.

We’re just going to do the same method which is to cross-multiply.

To solve the equation on the right, we have to distribute on each of term.

Now we have

Let’s get all the variables on one side by subtracting on both sides.

Simply solve by dividing both sides by .

And we’ll have

Complex proportion is different from regular proportion because it has a variable on both sides of the equation.

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