How to simplify an expression?

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I have tried to simplify this expression for quite a long time now but I can't find how to do it.

$$\left(\frac{1}{2+4m}-\frac{1-m}{8m^3+1}:\frac{1-2m}{2m^2-2m+1}\right)\cdot\frac{4m+2}{2m-1}-\frac{1}{1-4m+4m^2}$$

Can someone help me with it?