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2x = 4y - 5
3x + y = 6,5 |*4
2x - 4y = -5
12x + 4y = 26
2x - 4y = -5
------------------- +
14x = 21 /:14
x = 1,5
y = 6,5 - 3 * 1,5 = 6,5 - 4,5
y = 2
{x = 1,5
{y = 2