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1) 3x^{2} +7xy^{2} + 9x^{2}y
x^{2} + xy^{2}+ x^{2}y
2) ab- 7ab – a^{2} + a
– ab – ^{2} +
3) 16x + 3y – 12x –y
= x + y
4) 20x + 4 – 3x + 9
x +
5) -3x +5x – y – 5y
= x} – y
6) 6x^{2} + xy + 4y^{2}
= x^{2} + + y^{2}
7) 5x + 3 + 4x +7
x +
8) X^{2} + 3x + 2x^{2} + 3x
= x^{2} +
9) X – 2y + 8x + y
x –
10) a^{2}b – 5ab^{2} + 5a^{2}b + 2ab^{2}
= a^{2}b – ab^{2}