$$ \begin{aligned} 13 &= -6v+11&& \text{ swap the left and right side of the equation } \\[1 em]-6v+11 &= 13&& \text{ move 11 to the right } \\[1 em]-6v &= 13-11&& \\[1 em]-6v &= 2&& \text{ divide both sides by $ -6 $ } \\[1 em]v &= -\frac{2}{6}&& \\[1 em]v &= -\frac{1}{3}&& \\[1 em] \end{aligned} $$
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