Why the hell have u done 7 bits...and not even specified if u want it for 8 or 7 or 6 or whatever.
Presuming the 7 bits..
The first 1 is a minus.
SO already its -64
Then 32, nothing nothing, 4, 2, nothing
= -26
OR
2's comp:
0011001
0011010
=
2+8+16
=
26
...
SO THERE U...