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b. 5x²-x+25x-5= 5x² +24x -5
c. 14x-49-4x²-14x= -4x²-49
b. 5 - x + 25x - 5 ⇒ 5 + 24x - 5
c. 14x -49 - 4 +14x ⇒ -4 +14x +14x -49 ⇒ -4 +28x - 49