$$3x+5x+7x+5+3=966$$
$x = \frac{958}{15} = 63\frac{13}{15} \approx 63.866666667$
$$8x+7x+5+3=966$$
$$15x+5+3=966$$
$$15x+8=966$$
$$15x=966-8$$
$$15x=958$$
$$x=\frac{958}{15}$$
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