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Bring a large pot of heavily salted water to a boil.
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Meanwhile, over low heat, combine alfredo, marinara, and basil in a medium saucepan; stirring until well blended.
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Cook pasta a minute passed al dente according to package instructions.
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Drain the pasta, reserving 1/2-1 cup of the cooking water, and return pasta to pot.
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Toss the pasta with creamy tomato sauce and half of the reserved cooking water; let cook for a few minutes until ready. Add more reserved cooking water if necessary.
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Season to taste with salt and pepper.
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Serve with parmesan cheese and extra basil, if desired.