$$(V+3) \times 8=(V-3) \times 10$$
$V=27$
$$8V+24=\left(V-3\right)\times 10$$
$$8V+24=10V-30$$
$$8V+24-10V=-30$$
$$-2V+24=-30$$
$$-2V=-30-24$$
$$-2V=-54$$
$$V=\frac{-54}{-2}$$
$$V=27$$
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