SOLUTION: Please explain how the simplifying works to get from: D/3 = 4 + D/9, TO: 3D = 36 + D Also, where could I find more about this type of problem?

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Question 1345: Please explain how the simplifying works to get from:
D/3 = 4 + D/9,
TO:
3D = 36 + D
Also, where could I find more about this type of problem?
Answer by usyim88hk(157) About Me  (Show Source):
You can put this solution on YOUR website!
Just multiply the original equation by 9
(D/3)(9) = 4(9)+(D/9)(9)
3D = 36+D