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-4/3 (-9) = 12. 12+11= 23.
answer : (-9,23)
-4/3 (-3) = 4. 4+11= 15.
answer: (-3,15)
-4/3 (3) = -4. -4+11= 7.
answer: (3,7)
-4/3 (6) = -8. -8+11=3.
answer: (6,3)