Answer:-5The Problem:If [tex]-2x+5x+3=12[/tex], then the value of [tex]x-8[/tex] is ?Step-by-step explanation:Let's solve this for x:[tex]-2x+5x+3=12[/tex]Combine like terms:[tex]3x+3=12[/tex]Subtract 3 on both sides:[tex]3x=12-3[/tex]Simplify:[tex]3x=9[/tex]Divide both sides by 3:[tex]x=\frac{9}{3}[/tex]Simplify:[tex]x=3[/tex]So if [tex]x=3[/tex] then [tex]x-8=3-8=-5[/tex].