(6-x)(x+6)-(x-11)x=36
36-x^2-x+11=36
x^2+x-11=0
D=1+44=45
x1=(-1+3*sqrt5)/2
x2=(-1-3*sqrt5)/2
6x-x^2+36-6x-x^2+11x=36
-2x^2+11x=0
D=121
x1=(-11+11)/-4=0
x2=(-11-11)/-4=5.5
(6-x)(x+6)-(x-11)x=36
36-x^2-x+11=36
x^2+x-11=0
D=1+44=45
x1=(-1+3*sqrt5)/2
x2=(-1-3*sqrt5)/2
6x-x^2+36-6x-x^2+11x=36
-2x^2+11x=0
D=121
x1=(-11+11)/-4=0
x2=(-11-11)/-4=5.5