what formula can be use to find Currently, Sam's coach is twice as old as Sam. When Sam started soccer 10 years ago, his coach was 3 times his age. How old is Sam now?..... i do NOT want the answer just the formula to find the answer

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y = Sam's coach's age
x = Sam's age
y = 2x
y - 10 = 3(x - 10)

hopefully that's a good enough starting point :) if not just ask

i have not the slightest idea except it can either be 20, 10, 30 or 15

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