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6-145.

After the math contest, Basil noticed that there were four extra-large pizzas that were left untouched. In addition, another three slices of pizza were uneaten. If there were a total of slices of pizza left, how many slices does an extra-large pizza have?

Begin by defining a variable. Let the number of slices in one pizza

Write an equation that says that the slices in pizzas plus the extra slices equals total slices.