\[y = f(x);\ \ \ f(x) = x^{2}\]
\[f(x - 2) = f(x + 5)\]
\[(x - 2)^{2} = (x + 5)^{2}\]
\[(x - 2)^{2} - (x + 5)^{2} = 0\]
\[(x - 2 - x - 5)(x - 2 + x + 5) =\]
\[= 0\]
\[- 7 \bullet (2x + 3) = 0\]
\[2x = - 3\]
\[x = - 1,5.\]
\[Ответ:\ - 1,5.\]