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=2x-4x+3y-5y
=-2x -2y
2. 9x²+7x²+8x²+5x²
= (9+7+8+5)x²
= 29 x²
2x -4x +3y -5y
-2x -2y
2. 9x² +7x² -8x² -5x²
3x²