Фигурная 2 х+3 (х+у) = 11

скобка 7 (х+3 у) - 4 у=-23

{2x+3 (x+y) = 11

{7 (x+3y) - 4y=-23

{2x+3x+3y=11

{7x+21y-4y=-23

{5x+3y=11

{7x+17y=-23

{5x=11-3y

{7x+17y=-23

{x = (11-3y) / 5

{7x+17y=-23

{x=

{ (7 * (11-3y)) / 5+17y=-23

{

{ (77-21y+85y) / 5=115/5

{

{77+64y=115

{

{64y=115-77

{

{y=38/64=19/32

{x = (11-3 * (19/32)) / 5 = (11 - (57/32)) / 5 = (((352-57) / 32) / 5) = (295/32) / 5=59/32