Answers

2014-08-06T10:32:41+08:00
It is the same as 
x-1=8
x=8+1
x=9


0
2014-08-06T10:54:44+08:00
(X-1) =8 
 x-1= 8 
x= -1+8 (transpose) 
x= 7 
0
Comment has been deleted
Oh yeah, lol sorry.
it's ok