Encontre todas as soluções (reais) do sistema 3x1−x2−x3−x5=0,−x1+3x2−x4−x6=0,−x1+3x3−x4−x7=0,−x2−x3+3x4−x8=0,−x1+3x5−x6−x7=0,−x2−x5+3x6−x8=0,−x3−x5+3x7−x8=0,−x4−x6−x7+3x8=0.
