Dear forum members,

I have two equations to solve

b) (x-11)=16

c) (x+1)=6

NOTE! PLEASE PRETEND THE PARENTHESES ARE ABSOLUTE VALUE BARS.

I know how to solve them, but there is something in my teacher's answers which baffles me.

for b) she wrote x=-5 or X=-7 and for c) =-7 and x=5

Why use or in b and then and in c?

Could someone please explain?

Thank you in advance!