SOLUTION: Please help me solve this!: Mary has n dollars. John has $7 less than 3 times the amount of money Mary has. How many dollars does John have?

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Question 301962: Please help me solve this!:
Mary has n dollars. John has $7 less than 3 times the amount of money Mary has. How many dollars does John have?

Answer by london maths tutor(243) About Me  (Show Source):
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Mary has n dollars. John has $7 less than 3 times the amount of money Mary has. How many dollars does John have?
John has $(3n - 7)