$$-6(1-7v)\le288$$
$v\leq 7$
$$1-7v\geq \frac{288}{-6}$$
$$1-7v\geq -48$$
$$-7v\geq -48-1$$
$$-7v\geq -49$$
$$v\leq \frac{-49}{-7}$$
$$v\leq 7$$
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