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Anonymous
1. 7d-13=3d+72. 7d-20=3d3. -20=-4d4. d=55. Check your answer:7*5-13=22, 3*5+7=22D equals 5
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c = 6 and d = 7
It equals 24.
89
144 9+7 = 16 and 9*16 = 144