Фигурная 2х+3(х+у)=11 скобка 7(х+3у)-4у=-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