To find the number that makes the equation \(-\frac{3}{10} \cdot x = 1\) true, you can solve for \(x\) by isolating it.
Here are the steps:
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Start with the equation: \[ -\frac{3}{10} \cdot x = 1 \]
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To isolate \(x\), divide both sides by \(-\frac{3}{10}\): \[ x = \frac{1}{-\frac{3}{10}} \]
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Dividing by a fraction is the same as multiplying by its reciprocal: \[ x = 1 \cdot \left(-\frac{10}{3}\right) = -\frac{10}{3} \]
So, the number that makes the statement true is: \[ \boxed{-\frac{10}{3}} \]