The amount of paint needed to cover the walls of a bedroom is 133x, where xx is the thickness of the coat of paint. The amount of same paint that is required to cover the walls of the den is 91x. How much more paint is needed for the bedroom than for the den? Express your answer as a monomial in terms of x.

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Polynomials

Try substituting 1. You will get 6 and not 0. Try other real values also. What About -2? Let us check.