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x - y = 5
3y + 2x = 5
y = x - 5
3(x - 5) + 2x = 5
y = x - 5
3x - 15 + 2x = 5
y = x - 5
5x = 20 /:5
y = x - 5
x = 4
y = 4 - 5
x = 4
y = -1
{x = 4}
{y = -1}