Question 1063232
{{{x-7<=x<=-5}}}
This is two combined inequalities.



{{{x-7<=x}}}
But x cannot be isolated.
{{{x-7-x<=x-x}}}
{{{-7<=0}}}--------this part true for all x.



{{{x<=-5}}}------nothing more to do on this part.  Just as stated.



You want the solution parts which are true for BOTH parts.
The solutions that are common to both is that {{{highlight(x<=-5)}}}.