4x_+1.9=15.4

To solve this equation for x, we need to isolate the variable x on one side of the equation.

First, let's subtract 1.9 from both sides of the equation:
4x + 1.9 - 1.9 = 15.4 - 1.9
4x = 13.5

Next, divide both sides of the equation by 4 to solve for x:
4x/4 = 13.5/4
x = 3.375

Therefore, the solution to the equation 4x + 1.9 = 15.4 is x = 3.375