Д) х/7=20/28

To solve the equation, you can cross-multiply and then divide both sides by the coefficient of x.

Cross-multiplying, you would have:

28x = 720

Multiplying the numbers on each side, you would get:

28x = 140

Now, divide both sides of the equation by 28:

x = 140 / 28

Now, simplify the fraction:

x = 5

So the solution to the equation is x = 5.