\(2f\left(3-x\right)+f\left(x\right)=8x-6\) (1)
\(\Rightarrow2f\left(x\right)+f\left(3-x\right)=8\left(3-x\right)-6\)
\(\Leftrightarrow2f\left(x\right)+f\left(3-x\right)=18-8x\)
\(\Leftrightarrow4f\left(x\right)+2f\left(3-x\right)=36-16x\) (2)
Trừ vế cho vế (2) và (1):
\(3f\left(x\right)=42-24x\Rightarrow f\left(x\right)=14-8x\)
\(\Rightarrow\int\limits^1_0\left(14-8x\right)dx=10\)