[tex]-\left ( 2-x+x^2 \right )+\left ( x^2-x-1 \right )-\left ( x^2-4x-3 \right )=\\=-2+x-x^2+x^2-x-1-x^2+4x+3=\\=4x-x^2\overset{x=5}{\Rightarrow }4\cdot 5-5^2=20-25=-5[/tex]
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[tex]-\left ( 2-x+x^2 \right )+\left ( x^2-x-1 \right )-\left ( x^2-4x-3 \right )=\\=-2+x-x^2+x^2-x-1-x^2+4x+3=\\=4x-x^2\overset{x=5}{\Rightarrow }4\cdot 5-5^2=20-25=-5[/tex]