Вы ввели
-610*x3 + 3460*x1 - 2080*x2 = 560 -120*x3 - 2080*x1 + 2990*x2 = 430 -610*x1 - 120*x2 + 1180*x3 = 0
x1*3460 - x2*2080 - x3*610 = 560 x2*2990 - x1*2080 - x3*120 = 430 x3*1180 - x2*120 - x1*610 = 0
$$- 610 x_{3} + 3460 x_{1} - 2080 x_{2} = 560$$<br><br>$$- 120 x_{3} + - 2080 x_{1} + 2990 x_{2} = 430$$<br><br>$$- 610 x_{1} + - 120 x_{2} + 1180 x_{3} = 0$$