Sagot :
[tex]
-(x-10)=7 \ \ \ \ | omit\ the\ bracket\\\\
-x+10=7\ \ \ \ | subtract\ 10\\\\
-x=-3\ \ \ | multiply\ by\ -1\\\\
x=3[/tex]
X=3 because -(3-10)= 7
you add the opposite of the opposite of 3 :D
you add the opposite of the opposite of 3 :D