1/3x²‐[4x‐(1/2x‐5)+1/2x²]+3.

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1/3x²‐[4x‐(1/2x‐5)+1/2x²]+3.1/3x²‐[4x‐(1/2x‐5)+1/2x²]+3.1/3x²‐[4x‐(1/2x‐5)+

1/3x²‐[4x‐(1/2x‐5)+1/2x²]+3.
1/3x²‐[4x‐(1/2x‐5)+1/2x²]+3.

1/3x²‐[4x‐(1/2x‐5)+1/2x²]+3.
1/3x²‐[4x‐(1/2x‐5)+1/2x²]+3
=1/3x²‐(4x-1/2x+5+1/2x²)+3
=1/3x²‐4x+1/2x-5-1/2x²+3
=(1/3x²‐1/2x²)+(-4x+1/2x)-5-+3
=-1/6x²-7/2x-2