SOLUTION: I don't get how to do 3r/4-4/5=7/10. Can you help?

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Question 665882: I don't get how to do 3r/4-4/5=7/10. Can you help?
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
3r/4-4/5=7/10
3r/4=7/10+4/5
3r/4=7/10+8/10
3r/4=15/10
r=(15/10)(4)
x=60/10
x=6