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s = Ounces Of Spaghetti 7s-28=56
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b = Cups Of Frozen Ground Beef 13b-91=117
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t = Cups Of Crushed Tomatos 21(t-18)=21(20-4t)
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e = Tablespoons Of Taco Seasoning 4e-56=58-72e
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Answer = Number Of Taco Shells 18(5-13)=18(25-1/4)
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c = Cups Of Shredded Cheese 14(c-13)=14(-13 1/2-2/3)
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o = Cups Of Chopped Onions 28(o-7)-4=28(7 2/3-.75)-4
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l = Cups Of Shredded Lettuce .50(l-40)13=.50(41=4.25)13
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