4x^2-3x-1=x-2 ===> 4x^2-3x-1-x+2=0 ===> 4x^2-4x+1=0 ===> (2x)^2-2*2x*1+1^2=0 ===> (2x-1)^2=0 ===> 2x-1=0 ===> x=1/2
