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Dylan's family is moving into an apartment. He is curious about how many people live in apartements as opposed to houses. He finds a study that states that during a 6-year period, the amounts of money in millions of dollars spent on buying houses B and renting houses R by United States residents are modeled by the following two polynomials.
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a+(-b)=a−b
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Consider the sum or difference of the given polynomials. Identify their degree or leading coefficient.