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9x - 3y = 6
__________ -
- 3x = 9
x = - 3
y = - 11
9x - 3y = 6 x2 18x - 6y = 12 -
-3y = 33
y = -11
2x -y = 5
2x - ( -11) = 5
2x + 11 = 5
2x = 5 -11
2x = -6
x = -3