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2x - 5y = 6
-y = 6 + 2x
2x - 5y = 6
y = - 6 - 2x
2x - 5(-6 - 2x) = 6
y = - 6 - 2x
2x + 30 + 10x = 6
y = - 6 - 2x
12x = - 24 /:12
y = - 6 - 2x
x = - 2
y = - 6 - 2 * (-2)
x = - 2
x = - 2
y = -6 + 4
x = - 2
y = - 2