Lisa's age is 4 years older than three times Sammy's age. Lisa is 28 years old. Let s represent Sammy's age. Which equation can be used to solve for Sammy's age?

3s = 28

4s + 3 = 28

s + 4 = 28

3s + 4 = 28

It lost me in the lesson HELP! please and explain it please

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