10x=-0.3

To solve the equation \(10x = -0.3\), you need to isolate \(x\). You can do this by dividing both sides of the equation by 10:

\[ x = \frac{-0.3}{10} \]

Now, calculating the right side:

\[ x = -0.03 \]

So the solution is:

\[ x = -0.03 \]