Решите систему уравнений. Желательно сложением
2(3x + 1) + 3(6y -1) = 7
{
(3x + 1) - 3(6y - 1) = 8
2(3x + 1) + 3(6y -1) = 7
{
(3x + 1) - 3(6y - 1) = 8
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