What is the formula or equation for Principle of moments?

As per the principle of moments,“The sum of the clockwise moments about any point must be equal to the sum of anti-clockwise moments about the same point, provided that the body is in equilibrium under the action of a number of parallel forces.”

According to the principle of moments,

Sum of anti-clockwise moments = sum of clockwise moments

The formula or equation for Principle of moments is given as,

                                m₁d₁ + m₂d₂ =m₃d₃ + m₄d₄