x+x/2-2-x^2-16/4=1
-x^2+3x/2-7=0
x^2-3x/2+7=0
(x-3/4)^2-(3/4)^2+7=0
(x-3/4)^2=7-9/16=103/16
x-3/4=±1/4√103
x=(3+√103)/4 或 x=(3-√103)/4