Question

llxl-3l=0
l5-lxll=0
llxl+3l=0
l7-lxll=0

Answer 1

llxl-3l=0

x=-3
l5-lxll=0

x=-5
llxl+3l=0

?
l7-lxll=0

x=-7

Answer 2

1. x = 3 ; x = -3 ;

2. x = 5 ; x = -5 ;

3. x = 3 ; x = -3 ;

4. x = 7 ; x = -7 ;