$$ \begin{aligned} 8 &= 11-3v&& \text{ swap the left and right side of the equation } \\[1 em]11-3v &= 8&& \text{ move 11 to the right } \\[1 em]-3v &= 8-11&& \\[1 em]-3v &= -3&& \text{ divide both sides by $ -3 $ } \\[1 em]v &= \frac{-3}{-3}&& \\[1 em]v &= 1&& \\[1 em] \end{aligned} $$