SOLUTION: 5d+9-4d=51-5d

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Question 12345: 5d+9-4d=51-5d
Answer by rapaljer(4671) About Me  (Show Source):
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5d+9-4d=51-5d
d +9 = 51 - 5d

Add 5d to each side:
d + 5d + 9 = 51 - 5d + 5d
6d + 9 = 51

Subtract 9 from each side:
6d + 9 - 9 = 51 - 9
6d = 42
d= 7

R^2 at SCC
d= 7