If EF = 7x , FG = 3x , and EG = 10 , what is EF?

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If EF = 7x , FG = 3x , and EG = 10 , what is EF?

By segment addition:
EF + FG = EG
7x + 3x = 10

To solve this equation for x, we type it in our search engine and we get:
x = 1

Evaluating EF = 7x with x = 1, we get:
EF = 7 * 1
EF = 7