How would you derive the velocity formula from this equation

its the de brogile equation

wavelength = Planck's constant / ( Mass x Velocity)

its simple but its confusing me. thanks for the help !

Move the denominator to the left side:
mass x velocity x wavelength = Planck's constant
Divide both sides by mass:
velocity x wavelength = Planck's constant / mass
Divide both sides by wavelength:
velocity = Planck's constant / (mass x wavelength)

I would just multiply by velocity and then divide by wavelength to get v = h/(m*λ)