[tex]\bf (x-5)^2-x^2=3\implies (x-5)(x-5)-x^2=3\implies \stackrel{\mathbb{F~~ O~~ I~~ L}}{(x^2-10x+25)}-x^2=3 \\\\\\ -10x+25=3\implies -10x=-22\implies x=\cfrac{-22}{-10}\implies x=\cfrac{11}{5}\implies x=2\frac{1}{5}[/tex]
