{12+3у-9=2х+10
{8х+20=10+2(3у+2у)
{12+3у-9=2х+10
{8х+20=10+6у+4у
{3у - 2х=10+9-12
{8х-6у-4у=10-20
{3у-2х=7
{8х-10у=-10
{-2х+3у=7(умножим на 4)
{8х-10у=-10
{-8х+12у=28
{8х-10у=-10
2у=18
У=9
Подставляем:
3*9-2х=7
27-2х=7
-2х=7-27
-2х=-20
2х=20
Х=10
Ответ:х=10;у=9
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