решите системы уравнений способом сложения :
1)
5х + у = 20
{
2х - у = 1
2)
2х+ 3у = 2
{
-2х + 5 у = - 18
1)
5х + у = 20
{
2х - у = 1
2)
2х+ 3у = 2
{
-2х + 5 у = - 18
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