Two-thirds a numer plus 4 is 7

Since we don't know the number yet, we'll give it a name.

That will make it easier to work with.

It can have any name. I've decided to call it ' Z '.

- - The number Z

- - Two thirds of the number 2/3 Z

- - Two thirds of the number plus 4 2/3 Z + 4

The question says that makes 7 : 2/3 Z + 4 = 7

Subtract 4 from each side: 2/3 Z = 3

Multiply each side by 3 : 2 Z = 9

Divide each side by 2 : Z = 4.5