Conversion to NAND?

Can someone please help me? I'm supposed to convert the equation above to NAND, and I have no idea why the correct solution above still has a negation. Please help me, I'm really starting to get desperate.

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AMG38
1 year ago

A boolean equation retains its validity when the entire equation is double-needed. Once negating would be wrong. The negation of a negation again causes complete lifting of a negation, so this is allowed.

The trick is to negate the equation four times and separate the negation lines in such a way that there are only AND links in the equation.

AMG38
1 year ago

Look at my updated answer or picture.