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= 15x²-18x²-3xy+5xy+6y²+2y²
= -3x²+2xy+8y²
2. =2(3x²-2xb+5)+ 3(6x²+2x-7)
= 6x²-4xb+10+18x²+6x-21
= 6x²+18x²-4xb+10-21+6x
= 24x²-4xb-11+6x