Let:
x = Unknown number
the sum of 6 times a number:
[tex]6x+[/tex]and 8 equals 7, so:
[tex]\begin{gathered} 6x+8=7 \\ \text{solve for x:} \\ \text{subtract 8 from both sides:} \\ 6x=7-8 \\ 6x=-1 \\ \text{divide both sides by 6:} \\ x=-\frac{1}{6} \end{gathered}[/tex]