2y+3,5

It seems like you have a mathematical expression, 2y+3,5.

To simplify this expression, we can combine the terms that are similar. However, it seems like you wrote the expression with both a number and a decimal point. If you meant to write the decimal point as part of the number, the expression can be written as 2y + 3.5. In this case, the expression cannot be further simplified as the terms 2y and 3.5 are not like terms.

If you meant to write the decimal point as a separate value, the expression would be 2y + 3 + 0.5. In this case, you can combine the terms 3 and 0.5 to simplify the expression to 2y + 3.5.