To solve the equation \(-\frac{x}{2.9} = -3\), we can follow these steps:
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Multiply both sides of the equation by \(-1\) to eliminate the negative sign:
\[ \frac{x}{2.9} = 3 \]
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Multiply both sides by \(2.9\):
\[ x = 3 \times 2.9 \]
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Calculate \(3 \times 2.9\):
\[ x = 8.7 \]
So, the solution is:
\[ \boxed{8.7} \]