21,71+4,06*у=27,8

To solve the equation \( 21.71 + 4.06y = 27.8 \), follow these steps:

1. Isolate the term with \( y \):

   \[ 4.06y = 27.8 - 21.71 \]

2. Calculate the right side:

   \[ 27.8 - 21.71 = 6.09 \]

   So the equation now is:

   \[ 4.06y = 6.09 \]

3. Solve for \( y \):

   \[ y = \frac{6.09}{4.06} \]

4. Calculate the value:

   \[ y \approx 1.50 \]

So, the solution to the equation is approximately \( y \approx 1.5 \).