y>_-3/2x+6 = 3x+2y>_12 y>-3x+6 = 3x-y>6 y>3x-6 = 3x+y>6 y<3x-6 = 3x-y<6 y<_-3/2+6 = 3x+2y<_12
3x+2y >= 12 3x+y > 6 -3x+y > -6 or 3x-y < 6 -3x+y < -6 or 3x-y > 6 3x+2y <= 12
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