\[\boxed{\mathbf{1077}\mathbf{\text{.\ }}Еуроки\ - \ ДЗ\ без\ мороки}\]
\[\frac{a + b + c}{a + b - c} = \frac{a - b + c}{a - b - c}\]
\[(a + b + c)(a - b - c) =\]
\[= (a + b - c)(a - b + c)\]
\[- 2c(a + b) + 2c(a - b) = 0\]
\[c( - a - b + a - b) = 0\]
\[- 2cb = 0\]
\[cb = 0\]
\[c = 0\ \ или\ \ \ \ b = 0.\]