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Understand the difference between Set (or =) and Equal (or ==) Suppose you want to solve the system of equations $x^2 + y^2 = 1$ and $x = 2y$ in Mathematica. So you type in the following code: Solve[{x^2 + y^2 = 1, x = 2 y}, {x, y}] You then get the following output: Set::write: Tag Plus in x^2+y^2 is Protected. >> Solve::ivar: 2 y is not a ...

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