SOLUTION: 4/5*x+9=21 what is x?

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Question 304735: 4/5*x+9=21 what is x?
Answer by mananth(16946) About Me  (Show Source):
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4/5*x+9=21
4/5*x=21-9
4/5*x=12
x= 5*21 /4
x=105/4