4,1x-2,9x+7,5=7,98

To solve the equation \( 4.1x - 2.9x + 7.5 = 7.98 \), follow these steps:

1. Combine like terms on the left side:

   \[ (4.1x - 2.9x) + 7.5 = 7.98 \]

   This simplifies to:

   \[ 1.2x + 7.5 = 7.98 \]

2. Subtract 7.5 from both sides of the equation:

   \[ 1.2x = 7.98 - 7.5 \]

   This simplifies to:

   \[ 1.2x = 0.48 \]

3. Finally, divide both sides by 1.2 to isolate \( x \):

   \[ x = \frac{0.48}{1.2} \]

   Calculate the division:

   \[ x = 0.4 \]

So the solution is:

\[ x = 0.4 \]