将x=1/2带入方程得
2f(1/2)+f(1/2)=3*(1/2)+2
解得
f(1/2)=7/6
将f(1/2)=7/6代入2f(x)+f(1/2)=3x+2
得
2f(x)=3x+5/6
f(x)=(3/2)x+5/12