y=3
y^3(y^3-y)=
3^3(3^3-3)=
27(27-3)=
27(24)=648
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Neither y3x-3 nor 3x-y3 are equations, and so neither of them can have a solution. Unfortunately, limitations of the browser used by Answers.com means that we cannot see most symbols. It is therefore impossible to give a proper answer to your question. Please resubmit your question spelling out the symbols as "plus", "minus", "equals" etc. And using ^ to indicate powers (eg x-squared = x^2).
6y-y3 = 3
14 minus -3 is 17
-8