0,5(x-6)^2+2x(8-x/4)=2
0.5*(x^2-12x+36)+2x*(8-x/4)-2=0
0.5x^2-6x+18+2x*(8-x/4)-2=0
0.5x^2-6x+18+(16-0.5x)*x-2=0
0.5x^2-6x+18+16x-0.5x^2-2=0
0.5x^2+10x+18-0.5x^2-2=0
10x+18-2=0
10x+16=0
x=-16/10
x=-1.6
0,5(x-6)^2+2x(8-x/4)=2
0.5*(x^2-12x+36)+2x*(8-x/4)-2=0
0.5x^2-6x+18+2x*(8-x/4)-2=0
0.5x^2-6x+18+(16-0.5x)*x-2=0
0.5x^2-6x+18+16x-0.5x^2-2=0
0.5x^2+10x+18-0.5x^2-2=0
10x+18-2=0
10x+16=0
x=-16/10
x=-1.6