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Q: Are there any values of the variable A for which the expressions 2 plus A and 2A have the same value?

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It is impossible to give any decimal/numeric value if we are not given the values of at least one variable, so the answer is B + B + B + C + C + C.

If I understand the question correctly, and that is by no means certain, then x = (y-1)/2

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Without an equality sign the given expression can't be considered to be an equation and so therefore a solution is not possible.

There is no variable, and the equation is not valid.

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A variable is any named value of a specified type that can hold any value of that type, and that can change that value at any time while the name is in scope. A constant is exactly the same as a variable except that its value must be set at the point of instantiation and the given value cannot be altered while the name remains in scope. In other words, a variable is a value that may vary while a constant is a value that always remains the same.

It is an expression in two variable: it is NOT an equation. There is no standard form for expressions.

It is a variable which can take any value.

And what is the question? - The value of such an expression will depend on the value assigned to the variable, in this case, "t".

Without an equality sign the given expressions are not equations and so finding the value of y is not possible

It is, in fact, an identity - which is an equation which is true for all values of the variable.

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