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Eve and Julian are making their own pizzas. Eve's crust weighs $18$ ounces, and Julian's crust weighs $12$ ounces. After Eve adds $4$ spoonfuls of tomato sauce to her pizza and Julian adds $8$ spoonfuls to his, the two pizzas weigh the same. Which equation can you use to find $w$, the weight of a spoonful of tomato sauce in ounces? How much does a spoonful of tomato sauce weigh? Simplify any fractions.