Question 77777
The answer of x=-16 is right but your check has a flaw. Your check says

{{{5(-16)+8+3(-16)+highlight((-16))+5=6(-16)-3}}} Notice I've highlighted -16

when it should be


{{{5(-16)+8+3(-16)+highlight(16)+5=6(-16)-3 }}}       Notice I changed the -16 on the left to +16 so we get. The reason why is we have x=-16 and we plug it into 

{{{5x+8+3x-x+5=6x-3}}} 

we get

{{{5(-16)+8+3(-16)-(-16)+5=6(-16)-3}}} Since we have {{{-(-16)}}} it becomes {{{16}}}

So our check comes to:

{{{5(-16)+8+3(-16)-(-16)+5=6(-16)-3}}}

{{{-80+11-48+16+5=-96-3}}}

{{{-99=-99}}}

And that verifies our answer.