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3x-4 -x+4+2x-6=4x - 6
2a²- a+4+a²+4a-3= 2a² + 4a + 1
3x²- 5x+ 7+ 2x² + 3x-5= 5x²-2x +2
2x-3+3x-4-6x+1= -x -6