SOLUTION: 4d+9d-(7-6d)

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Question 219684: 4d+9d-(7-6d)
Found 2 solutions by rfer, user_dude2008:
Answer by rfer(10417) About Me  (Show Source):
You can put this solution on YOUR website!
4d+9d-(7-6d)
13d-7+6d
19d-7

Answer by user_dude2008(1825) About Me  (Show Source):
You can put this solution on YOUR website!
4d+9d-(7-6d)=4d+9d-7+6d=19d-7

Answer: 4d+9d-(7-6d)=19d-7