Question: A simple substitution came up with error: 'Error, recursive assignment'

Would you help me to figure out how to solve this error?

 

totalsalesx := 60.1 + tax + profit

tax := 0.3*profit

profit := 0.1*totalsalesx

then, 'Error, recursive assignment'

What I want to do is to calculate the 'totalsalesx' from the cost (60.1). 

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