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81 - (8c) = 121
81 - 121 = 8c
8c = -40
c = -5
2.D = b^2 - 4ac
121 = -9^2 - 4.2.c
121 = 81 - 8c
121 + 81 = -8c
c = 202/-8
c = 25,25
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