the variable is Y
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It is a quadratic expression which when factored is (2y+3)(y+5)
To simplify Y plus Y, you can combine the like terms. In this case, both Y terms are like terms because they have the same variable. When you add them together, you get 2Y. Therefore, Y plus Y simplifies to 2Y.
how do u identify a independent variable
Like terms have the same variable, but can have different constants. 8y : variable is y, constant is 8 y: variable is y, constant is 1 (but this doesn't need to be shown) So yes, theses are like terms.
If I understand the question correctly, and that is by no means certain, then x = (y-1)/2