Решите систему способом подстановки
1) {2(x + y) - x + 6 = 0,
{3x - (x - y) = 0;
2) {3(x + 2y) - y - 27 = 0,
{4 (x + y) - 3x - 23 = 0;
1) {2(x + y) - x + 6 = 0,
{3x - (x - y) = 0;
2) {3(x + 2y) - y - 27 = 0,
{4 (x + y) - 3x - 23 = 0;
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