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Lo que hacemos es ordenar las variables para poderlas restar, asi:
R (x; y) = 4x – 5y + 2x + 3y + 3x – 2y
R (x; y) = 4x + 2x + 3x – 5y + 3y – 2y
R (x; y) = 9x + 3y – 7y
R (x; y) = 9x – 4y -> Expresión reducida
Espero ayude