Answer:
Solution given;
|-3x-6|=15
since
mistake mode is we need to take both sigh either positive or negative
modulus makes the negative value positive
we can keep ± instead of modulus
±(-3x-6)=15
±(3x+6)=15
taking positive
3x+6=15
3x=15-6
x=9/3
x=3
Taking negative
-(3x+6)=15
-3x-6=15
-3x=15+6
-3x=21
x=21/-3
x=-7