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I have a formula which I need to rearrange but it's been a while since I covered this at school, I've tried to read up and re-study but I keep getting confused about what I can/can't do to the various brackets.

The formula is:

M = (((W x L / 2) x (L / 2)) - ((W x L / 2) x (L / 4)))

I'm trying to rearrange in terms of W, so W = ...

Any help or advance anyone could offer would be greatly appreciated.

Thanks