35-10x+(x-6)(x+6)-(6-x)^2

Question

35-10x+(x-6)(x+6)-(6-x)^2

Answer 1

35-10x+x²+6x-6x-36-(36-12x+x²)=
35-10x+x²+6x-6x-36-36+12x-x²=
35-36-36-10x+6x-6x+12x+x²-x²=
-37+2x=
2x=37
x=18.5