Help me with this question

GRE Quant Problem Solving
1
  1. The Acme Rent-a-Car agency charges $10.00 per
    day and $0.10 per mile to rent a car. The Super
    Rent-a-Car agency charges $20.00 per day and
    $0.05 per mile to rent a car. If a car is rented for
    1 day, at how many miles would the rental charges
    of the two agencies be equal?
    (A) 50
    (B) 100
    © 150
    (D) 175
    (E) 200
2

Let number of miles be x. Then

10 + 0.1x = 20 + 0.05x

Solve for x.

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thank you