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If: d+7 = 5 Then: d = -2 by subtracting 7 from both sides
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(7 x 7) - (5 x 3)
7=dd=3 so 7 goes by 3+d = cC=cost and so it equals 10+1902 =1912
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