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