решить систему уравнений методом подстановки.
{x + 5y = 3
{2x - 3y = -1
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{y = 3 - 2x
{6x + y = -9
----------------
{x + 4y = -1
{x + y = 5
----------------
{x - y = 1
{2x + 4y = 11
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ДАЮ 100 БАЛЛОВ ЗА РЕШЕНИЕ​
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