\(\frac{x-3}{-2}=\frac{-6}{x-3}\Rightarrow\left(x-3\right)^2=12\)
Th1:
\(x-3=\sqrt{12}\Rightarrow x=\sqrt{12}+3\)
Th2:
\(x-3=-\sqrt{12}\Rightarrow x=-\sqrt{12}+3\)
suy ra: x-3.x-3=-2.-6
suy ra: x-3.x-3=12
suy ra: x-3.x=12:3
suy ra: x-3.x=4
suy ra: 2x=4:3
suy ra: 2x=0.5
suy ra: x =0.5:2
suy ra: x=0,25
<=>(x-3)(x-3)=12 <=> X2-6X+9-12=0 <=> X2-6X-3=0 <=> X=3+2\(\sqrt{3}\), X=3-2\(\sqrt{3}\)