solve this equation

0.04x-0.9x=5.16

combine the x terms by adding their coefficients. then undo normally

To solve the equation 0.04x - 0.9x = 5.16, we need to combine the x terms by adding their coefficients:

-0.86x = 5.16

Next, we can undo this by dividing both sides of the equation by -0.86:

x = 5.16 / -0.86

Now, we can simplify this expression:

x = -6

Therefore, the solution to the equation is x = -6.