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2. a.) ( 2x + 8 ) + ( 4x - 5 - 5y ) = 8x +3 - 5y
b.) (3P + Q) + (-2P - 5Q + 7) = P - 4Q + 7
c.) (3x^{2} + 2x - 1) + ( x^{2} + 5x + 6) = 4x^{2} + 7x + 5