Question: How do I change: x = h*D/ d where x = spacing of fringes d= distance between slits D= length between the grating and meter

How do I change: x = h*D/ d

where x = spacing of fringes

d= distance between slits

D= length between the grating and meter stick

h= wavelength

I need to find what the wavelength is, so how can I change the equation to be able to find the wavelength?

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