30x-75=0

To solve the equation \(30x - 75 = 0\), follow these steps:

1. Add \(75\) to both sides of the equation:

   \[ 30x = 75 \]

2. Divide both sides by \(30\) to isolate \(x\):

   \[ x = \frac{75}{30} \]

3. Simplify the fraction:

   \[ x = \frac{75 \div 15}{30 \div 15} = \frac{5}{2} = 2.5 \]

So the solution is:

\[ x = 2.5 \]