To solve the inequality \(-\frac{x}{3} \geq 5\), we will isolate the variable \(x\). Here are the steps:
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Multiply both sides by -3 (remember to reverse the inequality sign because we are multiplying by a negative number):
\[ -\frac{x}{3} \geq 5 \] becomes \[ x \leq -15. \]
So, to summarize the choices:
Isolate the variable \(x\) by: multiplying both sides by -3.
The inequality: changes direction when multiplying by -3.
The final answer will be: \(x \leq -15\).