Add the following algebraic expressions:
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a) 4xy^2 – 7x^2y , 12x^2y – 6xy^2 , -3x^2y + 5xy^2
b) 7x^2 – 4x + 5 , -3x^2 + 2x – 1 and 5x^2 - x + 9
c) 3a^2b , -4a^2b, 9a^2b
d) 3p^2q^2 – 4pq + 5 , -10p^2q^2 , 15 + 9pq + 7p^2q^2
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in attachments I have done all parts
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