Answer :

luana
[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

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