I need some geometry help :x?

Question

It's the second day of school, and I'm already messing up lol.

Point S is between R and T on line RT. Use the given information to write an equation in terms of x. Solve the equation. Then find RS and ST.

RS=2x+10

ST=x - 4

RT=21

Answer 1

2x +10+x-4=21

3x+6=21

3x=15

x=5

RS=20

ST=1

Answer 2

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