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2) -10a^4 - 40a^4 b + 25a^3 b²
3) 6x²y²+14xy+15xy+35
= 6x²y²+29xy+35
4) 9x²+24xy-24xy-64y²
= 9x²-64y²
5)
70-21y+30y-9y²
= -9y²+9y+70