Without an equality sign it cannot be classed as an equation
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Without an equality sign it can not be considered to be an equation
It seems like there might be a typo or missing operators in your expression "y 12x 3y9." If you intended to combine terms, it could be clearer with operators (like addition or multiplication). For example, if you meant (12x + 3y^9), it's a polynomial expression where (12x) and (3y^9) are separate terms. Please clarify if you meant something else!
Without an equality sign it cannot be classed as an equation
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", "squared", "cubed" etc.
2x-3y9/1
Without an equality sign it can not be considered to be an equation
Fortunately,you don't have to, because it's not an equation.
If you mean: 3x-3y = 9 and y-3x = -3 then by adding both equations y = -3 and by substitution x = 0