algebra

Family on a road trip. travels x miles on day 1. On day 2 they go 52 miles more than three times the number of miles traveled on day 1. The 3rd day they go 83 miles fewer than day 1. write and simplify an expression for the total number of miles traveled. the answer is 5x-3 but I don't know how they got it. Can you show me?

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  1. Day 1. x miles.
    2. 3x+52 miles.
    3. x-83 miles.

    D = x + 3x+52 + x-83 = 5x - 31.

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