\[8 - 4x = 10 - 7(x + 1)\]
\[8 - 4x = 10 - 7x - 7\]
\[- 4x + 7x = 3 - 8\]
\[3x = - 5\]
\[x = - \frac{5}{3} = - 1\frac{2}{3}.\]