Verified answer

[tex]\displaystyle 0,5(8x+1)=3,5-(2-6x)\\4x+0,5=3,5-2+6x\\4x+0,5=1,5+6x\\4x-6x=1,5-0,5\\-2x=1\\\\x=-\frac{1}{2}=-0,5[/tex]