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Mario's Pizza just received two big orders from customers throwing parties. The first customer, Vincent, bought 4 regular pizzas and 6 deluxe pizzas and paid $152. The second customer, Ronald, ordered 4 regular pizzas and 3 deluxe pizzas, paying a total of $92. What is the price of each pizza?

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  1. 4r + 6d = 152
    4r + 3d = 92

    6d + 4r = 152
    3d + 4r = 92
    6d + 4r - (3d + 4r) = 152 - 92
    6d + 4r - 3d - 4r = 152 - 92
    6d - 3d = 152 - 92
    d = 20

    3 * 20 + 4r = 92
    r = 8

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