first, let's only the expression with x stay on the let side: let's add 9 to both sides of the equation.
[tex] \frac{1}{2} x-9+9=-25+9[/tex]
which is
[tex] \frac{1}{2}x=-16[/tex]
now, let's multiply everything by 2:
[tex] \frac{2}{2} x=-16*2[/tex]
[tex] x=-32[/tex]
so the answer is -32!
