(0,5x −1 y) −5

I’m not sure what the exact problem is from "(0,5x −1 y) −5". Could you clarify? A couple of common possibilities:

• If you mean the expression (0.5x − y) − 5, then it simplifies to 0.5x − y − 5.
• If you mean the equation (0.5x − y) = −5 and you want x in terms of y, then x = 2y − 10.

If you can retype or give a bit more context (is it simplification, solving for a variable, or something else?), I’ll tailor the steps precisely.